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Synchrotron Methods Research Team

Angle-resolved photoemission spectroscopy group

Head: Dr. S. Borisenko

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Photoelectron spectroscopy of functional quantum materials group

Joint IFW-BESSY Junior Research Group

Head: A. Fedorov

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In order to understand, predict and control the physical properties of a material, it is necessary to know its electronic and crystal structures. This knowledge can be gained from the interaction of the matter with radiation.

The most efficient way to produce focused radiation of various wavelengths, small bandwidth and high intensity is realized at the large-scale facilities, the so-called synchrotron light sources. We study the microscopic behaviour of electrons and characterize static and dynamic properties of complex electron systems by means of state-of-the-art photoemission. We focus on synchrotron-based experiments. These experiments enable to study the electronic structure, elementary excitations, and static ordering of interacting electrons. We aim at establishing a comprehensive understanding of complex electron systems and their behaviour on various energy, time, and length scales. Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool to determine the low-energy electron dynamics in solids. We typically use the synchrotron radiation with the energies in the range of 6-300 eV to record the energy and momentum distribution of the photoelectrons which leave the surface of the sample. This distribution is then used to extract the spectral function – the probability to find the electron with given energy and momentum in the single-crystal, i.e. its electronic structure. Materials hosting complex electron systems are a treasure trove for fascinating physical properties that raise great expectations for technological applications. Very prominent examples are unconventional superconductors, topological insulators, electronic density waves, multiferroics or heavy fermion systems. These materials are in the focus of many other IFF activities. The Group is thus organically embedded in the structure of the institute. We are involved in numerous internal research projects and can also provide a characterization service to other groups. External collaborations of the group constitute the powerful worldwide network with the participation of leading research institutions.


Research Topics

The subject of this research direction is a quantum phenomenon which represents one of the most persistent problems of condensed matter physics. The absence of a quantitative and comprehensive theory of superconductivity not only demonstrates the lack of our understanding of solids on a fundamental level, but also makes a targeted synthesis of new materials impossible, thus blocking an enormous application potential of superconductors. We are conducting comprehensive and systematic studies of the superconductors and hope that they will substantially advance our knowledge of superconductivityat a microscopic level as well as suggest new routes towards improving the existing and designing the new materials for applications.

The search for the topological matter is one of the central tasks of modern condensed matter physics. The discovery of quantum Hall effect (QHE) demonstrated that the ordering phenomena in solids can not only be characterized by the broken symmetry and order parameter in a sense of Landau theory, but also can be of a topological type. During the last years several compounds have been identified to be topological insulators, but in order to be suitable for any of the vast majority of the device or experimental configurations that have been proposed to utilize giant magnetoelectric and anomalous optical rotation, unusual excitonic condensation, spin-Galvanic effects, or the neutral half-fermions and interface superconductivity, the new topological materials are needed with improved functional properties. Among them are the high degree of bulk resistivity and insulation, electronic structure with both in-gap Dirac point and Fermi level and longer surface state life-time. Since the energy gap is needed to stabilize the topological phase, it is anticipated that the superconductivity can also be topologically non-trivial. Up to date such materials have not been clearly identified. Strong spin-orbit coupling as well as on-site Coulomb repulsion occurring on a similar energy scale implies possible topologically nontrivial phases including topological quantum phase transitions between some compounds of this series. Thus it is highly demanded to find new examples of topological materials in order to realize the promising applications. Angle-resolved photoemission spectroscopy is an ideal technique to study topological phases since it directly probes low-energy electronic structure of solids. Being very sensitive also to the surface states, the method delivers precise information as regards their dispersion, scattering rate, symmetry, intensity, etc. Using the different photon energies one is able to map also the bulk related electronic structure thus clearly identifying the origin of the observed electronic states.


Spontaneous symmetry breaking plays an important role in physics of very different phenomena,starting from the explanation of the observed masses of elementary particles up to the formation of stars. In condensed matter physics the symmetry of a crystal may spontaneously break due to theformation of a density wave - a state when magnetic moment, charge distribution, and/ororbital occupation vary in space with period larger than the lattice constant. The density waves in solids are a fascinating example of the self-organization of the valence electrons which leads to significant modifications of the physical properties of the material. It is currently under intense debates whether the charge and/or spin-density waves and their fluctuations are indispensable ingredients for the high-temperature superconductivity in the cuprates and Fe-superconductors. Our aim is to clarify the origin of the interplay between CDW and superconductivity and to extend the developed approach to the phase diagrams of the chalcogenides with low critical transition temperatures using modern ARPES and its combination with other techniques.


Angle-Resolved Photoemission Spectroscopy Group

Photoelectron spectroscopy of functional quantum materials

The junior research group is set up to strengthen the collaboration between the HZB and IFW in the field of photoemission spectroscopy of quantum materials by means of further improvement of experimental equipment at BESSY synchrotron. Nowadays the successful photoemission experiments require state-of-the-art combination of synchrotron beamline and end-station with the spectrometer. It should provide the high momentum and energy resolution, broad temperature range at which measurements are possible with the emphasis of the coldest side, as well as a high degree of the automatization. A special importance have the integration of all the components including the monochromator of the beamline, cryostat, electron energy analyzer and manipulator into a common system with flexible communication between all these components and comfortable user interface. With the help of such improved experimental equipment the group is supposed to demonstrate how the modern photoemission experiment can contribute to design and understanding of novel quantum functional materials.

Group Leader: Dr.  Alexander Fedorov

Phone: +49 351 4659 566


Energy scale of nematic ordering in the parent iron-based superconductor BaFe2As2 A. Fedorov et al, Phys. Rev. B 100, 024517 (2019)

Journal Papers

M. Krivenkov, D. Marchenko, E. Golias, M. Sajedi, A.S. Frolov, J. Sánchez-Barriga, A. Fedorov, L.V. Yashina, O. Rader, A. Varykhalov
Lifshitz transition in titanium carbide driven by a graphene overlayer
Physical Review Research 5, 023120/1-7 (2023) URL

P. Kagerer, C.I. Fornari, S. Buchberger, T. Tschirner, L. Veyrat, M. Kamp, A.V. Tcakaev, V. Zabolotnyy, S.L. Morelhão, B. Geldiyev, S. Müller, A. Fedorov, E. Rienks, P. Gargiani, M. Valvidares, L.C. Folkers, A. Isaeva, B. Büchner, V. Hinkov, R. Claessen, H. Bentmann, F. Reinert
Two-dimensional ferromagnetic extension of a topological insulator
Physical Review Research 5, L022019/1-7 (2023) URL

R. Lou, A. Fedorov, L. X. Zhao, A. Yaresko, B. Büchner, S. Borisenko
Signature of weakly coupled f electrons and conduction electrons in magnetic Weyl semimetal candidates PrAlSi and SmAlSi
Physical Review B 107, 035158 (2023) URL

D.V. Potorochin, R. Kurleto, O.J. Clark, E.D.L. Rienks, J. Sánchez-Barriga, F. Roth, V. Voroshnin, A. Fedorov, W. Eberhardt, B. Büchner, J. Fink
Lifetime of quasiparticles in the nearly free electron metal sodium
Physical Review B 106, 125138/1-7 (2022) URL

S. Borisenko, A. Fedorov, A. Kuibarov, M. Bianchi, V. Bezguba, P. Majchrzak, P. Hofmann, P. Baumgärtel, V. Voroshnin, Y. Kushnirenko, J. Sánchez-Barriga, A. Varykhalov, R. Ovsyannikov, I. Morozov, S. Aswartham, O. Feia, L. Harnagea, S. Wurmehl, A. Kordyuk, A. Yaresko, H. Berger, B. Büchner
Fermi surface tomography
Nature Communications 13, 4132/1-6 (2022) URL

M. Mende, K. Ali, G. Poelchen, S. Schulz, V. Mandic, A.V. Tarasov, C. Polley, A. Generalov, A.V. Fedorov, M. Güttler, C. Laubschat, K. Kliemt, Y.M. Koroteev, E.V. Chulkov, K. Kummer, C. Krellner, D.Yu. Usachov, D.V. Vyalikh
Strong Rashba Effect and Different f−d Hybridization Phenomena at the Surface of the Heavy‐Fermion Superconductor CeIrIn5
Advanced Electronic Materials 8, 2100768/1-8 (2022) URL

A. Grebenko, D. Krasnikov, A. Bubis, V. Stolyarov, D. Vyalikh, A. Makarova, A. Fedorov, A. Aitkulova, A. Alekseeva, E. Gilshtein, Z. Bedran, A. Shmakov, L. Alyabyeva, R. Mozhchil, A. Ionov, B. Gorshunov, K. Laasonen, V. Podzorov, A. Nasibulin
High‐Quality Graphene Using Boudouard Reaction
Advanced Science 9, 2200217/1-12 (2022) URL

F. Serrano-Sanchez, M. Yao, B. He, D. Chen, A. Gloskovskii, A. Fedorov, G. Auffermann, E. Liu, U. Burkhardt, G.H. Fecher, C. Fu, C. Felser, Y. Pan
Electronic structure and low-temperature thermoelectric transport of TiCoSb single crystals
Nanoscale 14, 10067-10074 (2022) URL

S.-L. Lee, Y.W. Windsor, A. Fedorov, K. Kliemt, C. Krellner, C. Schüßler‐Langeheine, N. Pontius, M. Wolf, U. Atxitia, D.V. Vyalikh, L. Rettig
Robust Magnetic Order Upon Ultrafast Excitation of an Antiferromagnet
Advanced Materials Interfaces 9, 2201340/1-10 (2022) URL

V. Voroshnin, A.V. Tarasov, K.A. Bokai, A. Chikina, B.V. Senkovskiy, N. Ehlen, D.Yu. Usachov, A. Grüneis, M. Krivenkov, J. Sánchez-Barriga, A. Fedorov
Direct Spectroscopic Evidence of Magnetic Proximity Effect in MoS2 Monolayer on Graphene/Co
ACS Nano 16, 7448-7456 (2022) URL

A. Kuibarov, A. Fedorov, V. Bezguba, H. Berger, A. Yaresko, V. Voroshnin, A. Kordyuk, P. Baumgärtel, B. Büchner, S. Borisenko
Isolated fourfold fermion in BiTeI
Physical Review B 105, 235112/1-6 (2022) URL

B. Schrunk, Y. Kushnirenko, B. Kuthanazhi, J. Ahn, L. Wang, E. O’Leary, K. Lee, A. Eaton, A. Fedorov, R. Lou, V. Voroshnin, O. Clark, J. Sánchez-Barriga, S. Bud’ko, R. Slager, P. Canfield, A. Kaminski
Emergence of Fermi arcs due to magnetic splitting in an antiferromagnet
Nature 603, 610-615 (2022) URL

R. Lou, A. Fedorov, Q. Yin, A. Kuibarov, Z. Tu, C. Gong, E. Schwier, B. Büchner, H. Lei, S. Borisenko
Charge-Density-Wave-Induced Peak-Dip-Hump Structure and the Multiband Superconductivity in a Kagome Superconductor CsV3Sb5
Physical Review Letters 128, 036402/1-7 (2022) URL

M. Krivenkov, D. Marchenko, M. Sajedi, A. Fedorov, O. Clark, J. Sánchez-Barriga, E. Rienks, O. Rader, A. Varykhalov
On the problem of Dirac cones in fullerenes on gold
Nanoscale 14, 9124-9133 (2022) URL

F. Bisti, F. Priante, A. Fedorov, M. Donarelli, M. Fantasia, L. Petaccia, O. Frank, M. Kalbac, G. Profeta, A. Grüneis, L. Ottaviano
Electron-phonon coupling origin of the graphene π*-band kink via isotope effect
Physical Review B 103, 035119/1-5 (2021) URL

A. Inozemtseva, E. Kataev, A. Frolov, M. Amati, L. Gregoratti, K. Beranová, V. Dieste, C. Escudero, A. Fedorov, A. Tarasov, D. Usachov, D. Vyalikh, Y. Shao-Horn, D. Itkis, L. Yashina
On the catalytic and degradative role of oxygen-containing groups on carbon electrode in non-aqueous ORR
Carbon 176, 632-641 (2021) URL

C.-H. Chen, L. Spree, E. Koutsouflakis, D.S. Krylov, F. Liu, A. Brandenburg, G. Velkos, S. Schimmel, S. Avdoshenko, A. Fedorov, E. Weschke, F. Choueikani, P. Ohresser, J. Dreiser, B. Büchner, A. Popov
Magnetic Hysteresis at 10 K in Single Molecule Magnet Self‐Assembled on Gold
Advanced Science 8, 2000777/1-7 (2021) URL

A. Fedorov, G. Poelchen, S. Eremeev, S. Schulz, A. Generalov, C. Polley, C. Laubschat, K. Kliemt, N. Kaya, C. Krellner, E. Chulkov, K. Kummer, D. Usachov, A. Ernst, D. Vyalikh
Insight into the Temperature Evolution of Electronic Structure and Mechanism of Exchange Interaction in EuS
Journal of Physical Chemistry Letters 12, 8328-8334 (2021) URL

B. Senkovskiy, A. Nenashev, S. Alavi, Y. Falke, M. Hell, P. Bampoulis, D. Rybkovskiy, D. Usachov, A. Fedorov, A. Chernov, F. Gebhard, K. Meerholz, D. Hertel, M. Arita, T. Okuda, K. Miyamoto, K. Shimada, F. Fischer, T. Michely, S. Baranovskii, K. Lindfors, T. Szkopek, A. Grüneis
Tunneling current modulation in atomically precise graphene nanoribbon heterojunctions
Nature Communications 12, 2542/1-11 (2021) URL

J. Bannies, E. Razzoli, M. Michiardi, H. Kung, I. Elfimov, M. Yao, A. Fedorov, J. Fink, C. Jozwiak, A. Bostwick, E. Rotenberg, A. Damascelli, C. Felser
Extremely large magnetoresistance from electron-hole compensation in the nodal-loop semimetal ZrP2
Physical Review B 103, 155144/1-8 (2021) URL

Y. Falke, N. Ehlen, G. Marini, A.V. Fedorov, V.Y. Voroshnin, B.V. Senkovskiy, K. Nikonov, M. Hoesch, T.K. Kim, L. Petaccia, G. Di Santo, T. Szkopek, G. Profeta, A. Grüneis
Coupling to zone-center optical phonons in VSe2 enhanced by charge density waves
Physical Review B 104, 235137 (2021) URL

M. Yao, K. Manna, Q. Yang, A. Fedorov, V. Voroshnin, V.B. Schwarze, J. Hornung, S. Chattopadhyay, Z. Sun, S. Guin, J. Wosnitza, H. Borrmann, C. Shekhar, N. Kumar, J. Fink, Y. Sun, C. Felser
Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa
Nature Communications 11, 2033/1-7 (2020) URL

A.S. Frolov, J. Sánchez-Barriga, C. Callaert, J. Hadermann, A.V. Fedorov, D.Y. Usachov, A.N. Chaika, B.C. Walls, K. Zhussupbekov, I.V. Shvets, M. Muntwiler, M. Amati, L. Gregoratti, A.Y. Varykhalov, O. Rader, L.V. Yashina
Atomic and Electronic Structure of a Multidomain GeTe Crystal
ACS Nano 14, 16576-16589 (2020) URL

S.O. Filnov, I.I. Klimovskikh, D.A. Estyunin, A.V. Fedorov, V.Yu. Voroshnin, A.V. Koroleva, A.G. Rybkin, E.V. Shevchenko, Z.S. Aliev, M.B. Babanly, I.R. Amiraslanov, N.T. Mamedov, E.F. Schwier, K. Miyamoto, T. Okuda, S. Kumar, A. Kimura, V.M. Misheneva, A.M. Shikin, E.V. Chulkov
Probe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2
Physical Review B 102, 085149/1-7 (2020) URL

I. Kar, J. Chatterjee, L. Harnagea, Y. Kushnirenko, A. Fedorov, D. Shrivastava, B. Büchner, P. Mahadevan, S. Thirupathaiah
Metal-chalcogen bond-length induced electronic phase transition from semiconductor to topological semimetal in ZrX2 (X=Se and Te)
Physical Review B 101, 165122/1-10 (2020) URL

S. Borisenko, V. Bezguba, A. Fedorov, Y. Kushnirenko, V. Voroshnin, M. Sturza, S. Aswartham, A. Yaresko
Strongly correlated superconductor with polytypic 3D Dirac points
npj Quantum Materials 5, 67/1-8 (2020) URL

A. Chikina, A. Fedorov, D. Bhoi, V. Voroshnin, E. Haubold, Y. Kushnirenko, K. Kim, S. Borisenko
Turning charge-density waves into Cooper pairs
npj Quantum Materials 5, 22/1-5 (2020) URL

K. Bokai, A. Tarasov, V. Shevelev, O. Vilkov, A. Makarova, D. Marchenko, A. Petukhov, M. Muntwiler, A. Fedorov, V. Voroshnin, L. Yashina, C. Laubschat, D. Vyalikh, D. Usachov
Hybrid h-BN–Graphene Monolayer with B–C Boundaries on a Lattice-Matched Surface
Chemistry of Materials 32, 1172-1181 (2020) URL

G. Poelchen, S. Schulz, M. Mende, M. Güttler, A. Generalov, A. Fedorov, N. Caroca-Canales, C. Geibel, K. Kliemt, C. Krellner, S. Danzenbächer, D. Usachov, P. Dudin, V. Antonov, J. Allen, C. Laubschat, K. Kummer, Y. Kucherenko, D. Vyalikh
Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh2Si2
npj Quantum Materials 5, 70/1-7 (2020) URL

E. Haubold, A. Fedorov, F. Pielnhofer, I. Rusinov, T. Menshchikova, V. Duppel, D. Friedrich, R. Weihrich, A. Pfitzner, A. Zeugner, A. Isaeva, S. Thirupathaiah, Y. Kushnirenko, E. Rienks, T. Kim, E. Chulkov, B. Büchner, S. Borisenko
Possible experimental realization of a basic Z2 topological semimetal in GaGeTe
APL Materials 7, 121106/1-7 (2019) URL

A. Makarova, L. Fernandez, D. Usachov, A. Fedorov, K. Bokai, D. Smirnov, C. Laubschat, D. Vyalikh, F. Schiller, J. Ortega
Oxygen Intercalation and Oxidation of Atomically Thin h-BN Grown on a Curved Ni Crystal
Journal of Physical Chemistry C 123, 593-602 (2019) URL

O. Vilkov, E. Krasovskii, A. Fedorov, A. Rybkin, A. Shikin, C. Laubschat, J. Budagosky, D. Vyalikh, D. Usachov
Angle-resolved secondary photoelectron emission from graphene interfaces
Physical Review B 99, 195421/1-10 (2019) URL

A. Fedorov, A. Yaresko, E. Haubold, Y. Kushnirenko, T. Kim, B. Büchner, S. Aswartham, S. Wurmehl, S. Borisenko
Energy scale of nematic ordering in the parent iron-based superconductor BaFe2As2
Physical Review B 100, 024517/1-7 (2019) URL

S. Borisenko, D. Evtushinsky, Q. Gibson, A. Yaresko, K. Koepernik, T. Kim, M. Ali, J. van den Brink, M. Hoesch, A. Fedorov, E. Haubold, Y. Kushnirenko, I. Soldatov, R. Schäfer, R. Cava
Time-reversal symmetry breaking type-II Weyl state in YbMnBi2
Nature Communications 10, 3424/1-10 (2019) URL

D.Y. Usachov, K.A. Bokai, D.E. Marchenko, A.V. Fedorov, V.O. Shevelev, O.Y. Vilkov, E.Y. Kataev, L.V. Yashina, E. Ruehl, C. Laubschat, D.V. Vyalikh
Cobalt-assisted recrystallization and alignment of pure and doped graphene
Nanoscale 10, 12123-12132 (2018) URL

N. Ehlen, A. Sanna, B.V. Senkovskiy, L. Petaccia, A.V. Fedorov, G. Profeta, A. Grueneis
Direct observation of a surface resonance state and surface band inversion control in black phosphorus
Physical Review B 97, 045143/1-10 (2018) URL

S. Thirupathaiah, I. Morozov, Y. Kushnirenko, A. Fedorov, E. Haubold, T.K. Kim, G. Shipunov, A. Maksutova, O. Kataeva, S. Aswartham, B. Büchner, S. Borisenko
Spectroscopic evidence of topological phase transition in the three-dimensional Dirac semimetal Cd3(As1-xPx)2
Physical Review B 98, 085145/1-5 (2018) URL

V. Tayari, B.V. Senkovskiy, D. Rybkovskiy, N. Ehlen, A. Fedorov, C.Y. Chen, J. Avila, M Asensio, A. Perucchi, P. di Pietro, L. Yashina, I. Fakih, N. Hemsworth, M. Petrescu, G. Gervais, A. Grueneis, T. Szkopek
Quasi-two-dimensional thermoelectricity in SnSe
Physical Review B 97, 045424/1-9 (2018) URL

S. Thirupathaiah, Y. Kushnirenko, E. Haubold, A. Fedorov, E. Rienks, T.K. Kim, A.N. Yaresko, C.G.F. Blum, S. Aswartham, B. Büchner, S. Borisenko
Possible origin of linear magnetoresistance: Observation of Dirac surface states in layered PtBi2
Physical Review B 97, 035133/1-6 (2018) URL

B.V. Senkovskiy, D.Y. Usachov, A.V. Fedorov, T. Marangoni, D. Haberer, C. Tresca, G. Profeta, V. Caciuc, S. Tsukamoto, N. Atodiresei, N. Ehlen, C. Chen, J. Avila, M.C. Asensio, A.Y. Varykhalov, A. Nefedov, C. Woell, T.K. Kim, M. Hoesch, F.R. Fischer, A. Grueneis
Boron-Doped Graphene Nanoribbons: Electronic Structure and Raman Fingerprint
ACS Nano 12, 7571-7582 (2018) URL

D.Y. Usachov, A.V. Fedorov, O.Y. Vilkov, I.I. Ogorodnikov, M.V. Kuznetsov, A. Grueneis, C. Laubschat, D.V. Vyalikh
Electron-phonon coupling in graphene placed between magnetic Li and Si layers on cobalt
Physical Review B 97, 085132/1-8 (2018) URL

Z. Liu, R. Lou, P. Guo, Q. Wang, S. Sun, C. Li, S. Thirupathaiah, A. Fedorov, D. Shen, K Liu, H. Lei, S. Wang
Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB2
Physical Review X 8, 031044/1-7 (2018) URL

B. Senkovskiy, D.Y. Usachov, A.V. Fedorov, D. Haberer, N. Ehlen, F.R. Fischer, A. Grueneis
Finding the hidden valence band of N = 7 armchair graphene nanoribbons with angle-resolved photoemission spectroscopy
2D Materials 5, 035007/1-8 (2018) URL

B. Loret, Y. Gallais, M. Cazayous, R.D. Zhong, J. Schneeloch, G.D. Gu, A. Fedorov, T.K. Kim, S.V. Borisenko, A. Sacuto
Raman and ARPES combined study on the connection between the existence of the pseudogap and the topology of the Fermi surface in Bi2Sr2CaCu2O8+delta
Physical Review B 97, 174521/1-6 (2018) URL

Y.S. Kushnirenko, A. Fedorov, E. Haubold, S. Thirupathaiah, T. Wolf, S. Aswartham, I. Morozov, T.K. Kim, B. Büchner, S. Borisenko
Three-dimensional superconducting gap in FeSe from angle-resolved photoemission spectroscopy
Physical Review B 97, 180501/1-6 (2018) URL

A. Fedorov, L.V. Yashina, O.Y. Vilkov, C. Laubschat, D.V. Vyalikh, D.Y. Usachov
Spin-polarized Fermi surface, hole-doping and band gap in graphene with boron impurities
Nanoscale 10, 22810-22817 (2018) URL

B.V. Senkovskiy, M. Pfeiffer, S.K. Alavi, A. Bliesener, J. Zhu, S. Michel, A.V. Fedorov, R. German, D. Hertel, D. Haberer, L. Petaccia, F.R. Fischer, K. Meerholz, P.H.M. van Loosdrecht, K. Lindfors, A. Grueneis
Making Graphene Nanoribbons Photoluminescent
Nano Letters 17, 4029-4037 (2017) URL

E. Haubold, K. Koepernik, D. Efremov, S. Khim, A. Fedorov, Y. Kushnirenko, J. van den Brink, S. Wurmehl, B. Büchner, T.K. Kim, M. Hoesch, K. Sumida, K. Taguchi, T. Yoshikawa, A. Kimura, T. Okuda, S. Borisenko
Experimental realization of type-II Weyl state in noncentrosymmetric TaIrTe4
Physical Review B 95, 241108/1-7 (2017) URL

B.V. Senkovskiy, D. Haberer, D.Y. Usachov, A.V. Fedorov, N. Ehlen, M. Hell, L. Petaccia, G. Di Santo, R.A. Durr, F.R. Fischer, A. Grueneis
Spectroscopic characterization of N=9 armchair graphene nanoribbons
Physica Status Solidi-Rapid Research Letters 11, 1700157/1-5 (2017) URL

A. Generalov, M.M. Otrokov, A. Chikina, K. Kliemt, K. Kummer, M. Hoeppner, M. Guettler, S. Seiro, A. Fedorov, S. Schulz, S. Danzenbaecher, E.V. Chulkov, C. Geibel, C. Laubschat, P. Dudin, M. Hoesch, T. Kim, M. Radovic, M. Shi, N.C. Plumb, C. Krellner, D.V. Vyalikh
Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions
Nano Letters 17, 811-820 (2017) URL

B.V. Senkovskiy, A.V. Fedorov, D. Haberer, M. Farjam, K.A. Simonov, A.B. Preobrajenski, N. Martensson, N. Atodiresei, V. Caciuc, S. Bluegel, A. Rosch, N.I. Verbitskiy, M. Hell, D.V. Evtushinsky, R. German, T. Marangoni, P.H.M. van Loosdrecht, F.R. Fischer, A. Grueneis
Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons
Advanced Electronic Materials 3, 1600490/1-8 (2017) URL

Y.S. Kushnirenko, A.A. Kordyuk, A. Fedorov, E. Haubold, T. Wolf, B. Büchner, S. Borisenko
Anomalous temperature evolution of the electronic structure of FeSe
Physical Review B 96, 100504/1-5 (2017) URL

A. Fedorov, A. Yaresko, T.K. Kim, Y. Kushnirenko, E. Haubold, T. Wolf, M. Hoesch, A. Grueneis, B. Büchner, S.V. Borisenko
Effect of nematic ordering on electronic structure of FeSe
Scientific Reports 6, 36834/1-7 (2016) URL

N.I. Verbitskiy, A.V. Fedorov, C. Tresca, G. Profeta, L. Petaccia, B.V. Senkovskiy, .Y. Usachov, D.V. Vyalikh, L.V. Yashina, A.A. Eliseev, T. Pichler, A. Grueneis
Environmental control of electron-phonon coupling in barium doped graphene
2D Materials 3, 045003/1-8 (2016) URL

A. Sanna, A.V. Fedorov, N.I. Verbitskiy, J. Fink, C. Krellner, L. Petaccia, A. Chikina, D.Y. Usachov, A. Grueneis, G. Profeta
First-principles and angle-resolved photoemission study of lithium doped metallic black phosphorous
2D Materials 3, 025031/1-6 (2016) URL

M. Guettler, A. Generalov, M.M. Otrokov, K. Kummer, K. Kliemt, A. Fedorov, A. Chikina, S. Danzenbaecher, S. Schulz, E.V. Chulkov, Y.M. Koroteev, N. Caroca-Canales, M. Shi, M. Radovic, C. Geibel, C. Laubschat, P. Dudin, T.K. Kim, M. Hoesch, C. Krellner, D.V. Vyalikh
Robust and tunable itinerant ferromagnetism at the silicon surface of the antiferromagnet GdRh2Si2
Scientific Reports 6, 24254/1-11 (2016) URL

D.Y. Usachov, A.V. Fedorov, O.Y. Vilkov, A.E. Petukhov, A.G. Rybkin, A. Ernst, M.M. Otrokov, E.V. Chulkov, I.I. Ogorodnikov, M.V. Kuznetsov, L.V. Yashina, E.Y. Kataev, A.V. Erofeevskaya, V.Y. Voroshnin, V.K. Adamchuk, C. Laubschat, D.V. Vyalikh
Large-Scale Sublattice Asymmetry in Pure and Boron-Doped Graphene
Nano Letters 16, 4535-4543 (2016) URL

C. Struzzi, C.S. Praveen, M. Scardamaglia, N.I. Verbitskiy, A.V. Fedorov, M. Weinl, M. Schreck, A. Grueneis, S. Piccinin, S. Fabris, L. Petaccia
Controlled thermodynamics for tunable electron doping of graphene on Ir(111)
Physical Review B 94, 085427/1-10 (2016) URL

A.A. Eliseev, N.I. Verbitskiy, A.A. Volykhov, A.V. Fedorov, O.Y. Vilkov, I.I. Verbitskiy, M.M. Brzhezinskaya, N.A. Kiselev, L.V. Yashina
The impact of dimensionality and stoichiometry of CuBr on its coupling to sp2-carbon
Carbon 99, 619-623 (2016) URL

E.Y. Kataev, D.M. Itkis, A.V. Fedorov, B.V. Senkovsky, D.Y. Usachov, N.I. Verbitskiy, A. Grueneis, A. Barinov, D.Y. Tsukanova, A.A. Volykhov, K.V. Mironovich, V.A. Krivchenko, M.G. Rybin, E.D. Obraztsova, C. Laubschat, D.V. Vyalikh, L.V. Yashina
Oxygen Reduction by Lithiated Graphene and Graphene-Based Materials
ACS Nano 9, 320-326 (2015) URL

D. Usachov, A. Fedorov, M.M. Otrokov, A. Chikina, O. Vilkov, A. Petukhov, A.G. Rybkin, Y.M. Koroteev, E.V. Chulkov, V.K. Adamchuk, A. Grueneis, C. Laubschat, D.V. Vyalikh
Observation of Single-Spin Dirac Fermions at the Graphene/Ferromagnet Interface
Nano Letters 15, 2396-2401 (2015) URL

C. Struzzi, N.I. Verbitskiy, A.V. Fedorov, A. Nefedov, O. Frank, Kalbac, M., G. Di Santo, M. Panighel, A. Goldoni, J. Gaertner, W. Weber, M. Weinl, M. Schreck, Ch. Woell, H. Sachdev, A. Grueneis, L. Petaccia
High-quality graphene on single crystal Ir(111) films on Si(111) wafers: Synthesis and multi-spectroscopic characterization
Carbon 81, 167-173 (2015) URL

N.I. Verbitskiy, A.V. Fedorov, G. Profeta, A. Stroppa, L. Petaccia, B. Senkovskiy, A. Nefedov, C. Woell, D.Y. Usachov, D.V. Vyalikh, L.V. Yashina, A.A. Eliseev, T. Pichler, A. Grueneis
Atomically precise semiconductor-graphene and hBN interfaces by Ge intercalation
Scientific Reports 5, 17700/1-9 (2015) URL

D.Y. Usachov, A.V. Fedorov, A.E. Petukhov, O.Y. Vilkov, A.G. Rybkin, M.M. Otrokov, A. Arnau, E.V. Chulkov, L.V. Yashina, M. Farjam, V.K. Adamchuk, B.V. Senkovskiy, C. Laubschat, D.V. Vyalikh
Epitaxial B-Graphene: Large-Scale Growth and Atomic Structure
ACS Nano 9, 7314-7322 (2015) URL

A.V. Fedorov, N.I. Verbitskiy, D. Haberer, C. Struzzi, L. Petaccia, D. Usachov, O.Y. Vilkov, D.V. Vyalikh, J. Fink, M. Knupfer, B. Büchner, A. Grueneis
Observation of a universal donor-dependent vibrational mode in graphene
nature communications 5, 3257/1-8 (2014) URL

D. Haberer, L. Petaccia, A.V. Fedorov, C.S. Praveen, S. Fabris, S. Piccinin, O. Vilkov, D.V. Vyalikh, A. Preobrajenski, N.I. Verbitskiy, H. Shiozawa, J. Fink, M. Knupfer, B. Büchner, A. Grueneis
Anisotropic Eliashberg function and electron-phonon coupling in doped graphene
Physical Review B 88, 081401/1-5 (2013) URL

A. Paris, N. Verbitskiy, A. Nefedov, Y. Wang, A. Fedorov, D. Haberer, M. Oehzelt, L. Petaccia, D. Usachov, D. Vyalikh, H. Sachdev, C. Woell, M. Knupfer, B. Büchner, L. Calliari, L. Yashina, S. Irle, A. Grueneis
Kinetic isotope effect in the hydrogenation and deuteration of graphene
Advanced Functional Materials 23, 1628-1635 (2013) URL

D. Haberer, C.E. Giusca, Y. Wang, H. Sachdev, A.V. Fedorov, M. Farjam, S.K. Jafari, D.V. Vyalikh, D. Usachov, X. Liu, U. Treske, M. Grobosch, O. Vilkov, V.K. Adamchuk, S. Irle, S.R.P. Silva, M. Knupfer, B. Büchner, A. Grueneis
Evidence for a new two-dimensional C4H-type polymer based on hydrogenated graphene
Advanced Materials 23, 4497-4503 (2011) URL

N. Ehlen, J. Hall, B. Senkovskiy, M. Hell, J. Li, A. Herman, D. Smirnov, A. Fedorov, V. Yu Voroshnin, G. Di Santo, L. Petaccia, T. Michely, A. Grüneis
Narrow photoluminescence and Raman peaks of epitaxial MoS 2 on graphene/Ir(1 1 1)
2D Materials () URL

N. Ehlen, B. Senkovskiy, A. Fedorov, A. Perucchi, P. Di Pietro, A. Sanna, G. Profeta, L. Petaccia, A. Grüneis
Evolution of electronic structure of few-layer phosphorene from angle-resolved photoemission spectroscopy of black phosphorous
Physical Review B () URL

Invited Talks

A. Fedorov
Joint laboratory for Quantum Functional Materials at Bessy II Berlin
Individual talk | Diamond Light source
Berlin, Germany, 07.08.2019 - 07.08.2019

A. Fedorov
Electronic and spin structure of MoS2/Graphene heterostack
Spin-resolved photoemission and electronic structure of quantum and energy materials | Helmholtz-Zentrum Berlin HZB Bessy II
Berlin, Germany, 28.10.2019 - 29.10.2019