Angle-resolved photoemission directly reveals two pairs of Weyl points connected by the Fermi arcs in the canted antiferromagnet YbMnBi2.
Strong magnetic interactions inLn2@C80(CH2Ph) with huge coercivity through a redox-active metal-metal bond
Access and control of nonequilibrium large-momentum plasmon-polaritons in Hg0.81Cd0.19Te thin films using light sources in the standard telecommunications fiber-optics window
Manganese bismuth telluride heralds a new, post-doping era in the field of magnetic topological insulators
At the Institute for Solid State Research (German: Institut für Festkörperforschung , in short IFF) we host under one roof the synthesis and crystal growth of novel quantum- and nano-materials, a wide portfolio of experimental techniques that help us understand their physical properties, and the exploration of their potential for applications in fields from electronics to medicine. An important aspect of our work is the continuous improvement and development of experimental techniques.
In quantum materials potential functionalities for technological applications emerge from their complex, quantum mechanical electronic properties. Such complex electronic properties may result from the interplay and unusual ordering phenomena of electronic spin, orbital and charge degrees of freedom and can be observed in the context of topologically protected spin or charge states or for particular geometries.
Material classes include certain families of transition-metal oxides, molecular solids and a range of intermetallic materials. What sets these systems apart is that their valence and conduction electrons typically retain to some extent their atomic character, resulting in a rich interplay of localized and delocalized electronic degrees of freedom. This renders these materials both practically and conceptually very different from simple metals and semiconductors with well-understood itinerant quasi-particles. Often the quantum mechanical interplay between the localized and delocalized electronic degrees of freedom leads to anomalous charge transport properties, for instance due to the presence of metal-insulator transitions, and exceptional types of ordering phenomena, such as unconventional forms of superconductivity and quantum magnetism. Functionalities that arise from this are for instance large magnetocaloric effects, high temperature superconductivity, magnetism with very strong anisotropy and colossal/giant magnetoresistance.
The plethora of spectacular and surprising phenomena that can occur in quantum materials poses one of the greatest set of challenges for cutting-edge experimental and theoretical condensed matter physics. As a rule material-specific predictions for the occurrence of many of these phenomena are very difficult, even if some of the presently booming research topics in this field, for instance the investigation of magnetic skyrmions and new topological states of matter, have emerged from a strong theoretical research effort and remain being strongly pushed by it.
When the dimensions of materials are restricted to the nanometer length-scale, new electronic properties emerge. This is related to the fact that any macroscopic object, when scaled down to a nanometer-scale, starts exhibiting distinct quantum mechanical properties. However, at the nanoscale also entirely new physical properties may emerge, for instance at surfaces and interfaces of topological insulators (TIs) where the spin of surface electrons is locked to their momentum, a property that is interesting in the context of spintronics.
The technological ability to engineer and shape materials at the nanoscale opens up a very well-defined road to control the materials properties and functionality in a systematic manner. It requires the synthesis, modelling and structuring of nanosystems, which is pursued in the context of a broad span of nanoparticles, ranging from endohedral fullerenes, carbon-based buckytubes to intermetallic or oxide nanoparticles. This combined approach is also the basis for the design of interfaces and heterostructures of superconducting materials, magnetic systems and molecular solids. In these heterostructures charge transfer effects at or across interfaces are decisive for the properties and functionality. An advantage of such interfaces is that they can be modified and engineered to a much greater extent than bulk Quantum Materials.
Building on the traditional strength in the field of Quantum Materials, and in order to strengthen in particular this research area and its potential for device applications, in 2013 the Center for Transport and Devices of Emergent Materials (CTD) has been founded together with the TU Dresden.
Our research teams search for new materials with the outlined unusual electronic properties and study their fundamental physical properties using a broad range of experimental techniques. Customized high resolution methodology is developed according to the specific scientific questions and phenomena, and finally, based on the experimental results, the chemistry, the morphology and the intrinsic physical properties of the materials are optimized with respect to technical applications. Some of the methodological developments of our institute push the limits of current condensed matter research. Such set-ups as well as the special infrastructure for materials synthesis are made available to cooperation partners at universities (crystal growth laboratory), worldwide users (ARPES measurement stations at the Berlin Synchrotron BESSY), or to industry partners (laboratory for spectroelectrochemistry).
Based on our scientific expertise, our methodological experience, and based on our dedicated knowledge of specific materials classes, we also perform application-driven research in close cooperation with various industry partners. In many of these activities key challenges of the modern industrial and information society are addressed. For example, there are projects in cancer research based on our knowledge of molecular nanostructures.
Additionally, our specific methodology and expertise for spectroelectrochemistry, magnetic materials, and oxide nanomaterials is used in industry projects concerning energy and/or mobility. The activities on novel magnetic materials are also motivated by the urgent issues of resources and sustainability. Moreover, the industry-oriented research of our institute includes since many years the topic "Surface Acoustic Waves (SAW)" dealing with innovative micro-acoustic components and devices as well as the associated high-tech materials and technologies. The IFW-driven "SAWLab Saxony - Competence Center for Acoustoelectronic Phenomena, Technologies and Devices" aims to bundle our profound SAW knowledge with experience and demands of several small and medium-sized Saxon high-tech companies fostering the close cooperation of our institute with the regional industry.
In addition to the in-house techniques, in cooperation with our partners we apply the following techniques:
The Center of Spectroelectrochemistry in IFW has state-of-the-art equipment and expertise for in situ studies of the electrochemical electron transfer using IR, Raman, ESR, NMR, UV-vis-NIR and luminescence techniques. This list of spectroelectrochemical techniques available in the Center is quite unique, also on an international level.
Electrochemistry + spectroscopic method(s):
The Surface Dynamics Group possesses or has easy access to all equipment needed for the work on modern SAW systems . This includes a variety of unique and state-of-the-art tools and instruments for advanced simulation and extensive evaluation of thin films and bulk samples, as well as for the precise characterization of microacoustic devices under different ambient conditions:
2020 - R. Weser, A. Darinskii, M. Weihnacht, H. Schmidt
Experimental and numerical investigations of mechanical displacements in surface acoustic wave bounded beams
Ultrasonics | Band: 106 | S. 106077/ | URL
2020 - R. Weser, A. Winkler, M. Weihnacht, S. Menzel, H. Schmidt
The complexity of surface acoustic wave fields used for microfluidic applications
Ultrasonics | Band: 106 | S. 106160/ | URL
2020 - 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 | Band: 5 | Heft: 1 | S. 22/ | URL
2020 - M. Kiani, N. Du, M. Vogel, J. Raff, U. Hübner, I. Skorupa, D. Bürger, S. Schulz, O.G. Schmidt, D. Blaschke, H. Schmidt
Disturbing-Free Determination of Yeast Concentration in DI Water and in Glucose Using Impedance Biochips
Biosensors : open access journal | Band: 10 | Heft: 1 | S. 7/1-17 | URL
2020 - S. Vegesna, V. Bhat, D. Bürger, J. Dellith, I. Skorupa, O. Schmidt, H. Schmidt
Increased static dielectric constant in ZnMnO and ZnCoO thin films with bound magnetic polarons
Scientific Reports | Band: 10 | Heft: 10 | S. 6698/1-11 | URL
2020 - 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 | Band: 11 | Heft: 1 | S. 2033/1-7 | URL
2020 - 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 | Band: 32 | Heft: 3 | S. 1172-1181 | URL
2020 - 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 | Band: 101 | Heft: 16 | S. 165122/1-10 | URL
2019 - 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 | Band: 10 | S. 3424/1-10 | URL
2019 - M. Kiani, N. Du, M. Vogel, J. Raff, U. Hübner, I. Skorupa, D. Bürger, S. Schulz, O.G. Schmidt, H. Schmidt
P-N Junction-Based Si Biochips with Ring Electrodes for Novel Biosensing Applications
Biosensors : open access journal | Band: 9 | Heft: 4 | S. 120 | URL
2019 - 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 | Band: 100 | Heft: 2 | S. 024517/1-7 | URL
2019 - N. Puwenberg, C.F. Reiche, R. Streubel, M. Khan, D. Mukherjee, I.V. Soldatov, M. Melzer, O.G. Schmidt, B. Büchner, T. Mühl
Magnetization reversal and local switching ﬁelds of ferromagnetic Co/Pd microtubes with radial magnetization
Physical Review B | Band: 99 | Heft: 9 | S. 094438/1-8 | URL
2019 - R. Patra, R. Mattheis, H. Stöcker, M. Monecke, G. Salvan, R. Schäfer, O.G. Schmidt, H. Schmidt
Magnetooptical response of permalloy multilayer structures on different substrate in the IR-VIS-UV spectral range
Journal of Physics D: Applied Physics | Band: 52 | Heft: 48 | S. 485002/1-14 | URL
2019 - K. Lenz, R. Narkowicz, K. Wagner, C. Reiche, J. Körner, T. Schneider, A. Kákay, H. Schultheiss, U. Weissker, D. Wolf, D. Suter, B. Büchner, J. Fassbender, T. Mühl, J. Lindner
Magnetization Dynamics of an Individual Single‐Crystalline Fe‐Filled Carbon Nanotube
Small | Band: 15 | Heft: 49 | S. 1904315/1-9 | URL
2019 - 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
The Journal of Physical Chemistry C | Band: 123 | Heft: 1 | S. 593-602 | URL
2019 - S. Vegesna, D. Bürger, R. Patra, J. Dellith, B. Abendroth, I. Skorupa, O. Schmidt, H. Schmidt
Tunable large field magnetoconductance of ZnO, ZnMnO, and ZnCoO thin films
Journal of Applied Physics | Band: 125 | Heft: 21 | S. 215305/1-14 | URL
2019 - Y. Suhak, W.L. Johnson, A. Sotnikov, H. Schmidt, H. Fritze
Transport and Electromechanical Properties of Ca3TaGa3Si2O14 Piezoelectric Crystals at Extreme Temperatures
MRS Advances | Band: 4 | Heft: 9 | S. 515-521 | URL
2019 - N. Sato, K. Schultheiss, L. Körber, N. Puwenberg, T. Mühl, A. Awad, S. Arekapudi, O. Hellwig, J. Fassbender, H. Schultheiss
Domain Wall Based Spin-Hall Nano-Oscillators
Physical Review Letters | Band: 123 | Heft: 5 | S. 057204/1-5 | URL
2019 - 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 | Band: 99 | Heft: 19 | S. 195421/1-10 | URL
2019 - E. Haubold, A. Fedorov, F. Pielnhofer, I. Rusinov, T. Menshchikova, V. Duppel, D. Friedrich, R. Weihrich, A. Pfitzner, A. Zeugner, A. Isaeva, T. Setti, 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 | Band: 7 | Heft: 12 | S. 121106/1-7 | URL