illuminated Helium laboratory from outside through the window


Conferences & Workshops

Sept.-15-20, 2019 

ECASIA19: 18th European Conference on Applications of Surface and Interface Analysis

Oct. 1 – 2, 2018

 

SAW Symposium, Westin Bellevue Dresden, Dresden, Germany

Aug. 28-30, 2018 Spin , waves & interactions 2018, Greifswald, Germany

April 8- 11, 2018

 

667. WE-Heraeus-Seminar on System-oriented approach to thermoelectrics: Materials – Interfaces – Devices in Bad Honnef, Germany

March 11-16, 2018

 

Joint Conference of the Condensed Matter Divisions of the DPG and EPS,

  • Session "Geometry and Topology-Controlled Nanoarchitectures", organized by Prof. Dr. V. Fomin, IFW Dresden
  • Symposium “Topology in Condensed Matter Physics (SYTO)”, co-organizer Prof. Dr. Jeroen van den Brink, IFW Dresden
  • Symposium “Voltage Control of Functional Interfaces: Magneto-ionic Meet Memristive Systems (SYVC)”, Co-organizer Dr. Karin Leistner, IFW Dresden
 

Feb. 1, 2018

 

Workshop of the DFG Priority Programme 1458 “High Temperature Superconductivity in Iron Pnictides“, IFW Dresden

Jan.  29-31, 2018

 

EPSQMat 2018: International Workshop on Electron and photon spectroscopies of quantum materials: status and perspectives, IFW Dresden

Lectures this week


Wednesday 19.09.2018
Vortrag Research Team "Nanoscale chemistry"15:00
Location IFW Dresden D2E.32
Speaker Grzegorz Kamieniarz
Topic Lieb-Mattis theorem and spin frustration in molecular nanomagnets
Invited by Prof. Dr. Bernd Büchner
Contact Kerstin Höllerer

Friday 21.09.2018
Info Day09:30
Location IFW Dresden D2E.27
Speaker Expertrs from Brussels & Bonn
Topic EU Info Day for Nanotechnologies, Advanced Materials, Biotechnology, and Advanced Manufacturing and Processing (NMBP) and European Research Council (ERC) funding
Invited by Carsten Glück
Contact Carsten Glück

Friday 21.09.2018
IIN-Seminar13:00
Location Leibniz-IFW Dresden B3E.26
Speaker Caspar Hopfmann
Topic Relaxation Dynamics of Spin Qubits Confined in Quantum Dots
Quantum dots are arguably the best interface between matter spin qubits and flying photonic qubits. One promising example of future building blocks for quantum communication networks are photonic cluster states [1]. Using quantum dot devices to produce joint spin-photonic states requires the electronic spin qubits to be stored for extended times. Therefore, the study of the coherence of spins of various quantum dot confined charge carriers is important both scientifically and technologically.

We report on spin relaxation measurements performed on five different forms of electronic spin qubits confined in the very same quantum dot grown in [111] direction [2]. In particular, we use all optical techniques to measure the spin relaxation of the confined heavy hole and that of the dark exciton – a long lived electron-heavy hole pair with parallel spins. Our measured results for the spin relaxation of the electron, the heavy-hole, the dark exciton, the negative and the positive trions, in the absence of externally applied magnetic field, are in agreement with a central spin theory which attributes the dephasing of the carriers’ spin to their hyperfine interactions with the nuclear spins of the atoms forming the quantum dots. We demonstrate that the heavy hole dephases much slower than the electron. We also show, both experimentally and theoretically, that the dark exciton dephases slower than the heavy hole, due to the electron-hole exchange interaction, which partially protects its spin state from dephasing.

[1] I. Schwartz et. al., Science 354, 434-437 (2016).
[2] D. Cogan et. al., arXiv:1808.00284 (2018).


Invited by Prof. Dr. Oliver G. Schmidt, Prof. Dr. Fei Ding
Contact Kristina Krummer

Lectures next week


Monday 24.09.2018
IFF-Doktorandenseminar15:00
Location IFW Dresden D2E.27
Speaker Francesco Scaravaggi
Topic Revisiting the phase diagram of LaFe1-xCoxAsO by thermodynamic analysis
Invited by Prof. Dr. Bernd Büchner
Contact Christine Malbrich

Tuesday 25.09.2018
Vortrag Research Team "Thermoelectrics"10:00
Location IFW Dresden D2E.32
Speaker Aditya Dutt
Topic Development of Thermoelectric measurement system and Thermoelectric study of ZnO & LiCoO2
Invited by Dr. Gabi Schierning
Contact

Wednesday 26.09.2018
IKM-Seminar10:00
Location IFW Dresden, Helmholtzstraße 20 B 3E.26
Speaker Jeffrey McCord
Topic Challenges in ferromagnetic-piezoelectric magnetoelectric 2-2 composite sensor structures
From an engineering point of view, magnetoelastic interactions are often considered an effect that negatively affects soft-magnetic device applications. The use of magnetic materials with strong magnetoelastic contributions is challenging due to the strong coupling of stress and strain to the magnetic domain structure. Yet, the utilization of magnetostrictive effects offers a path to new sensor concepts with remarkable sensitivity and low limit of detection. Depending on the magnetic field frequency, the minimum detectable magnetic field can be below 1 pT/Hz^1/2.
For the performance of resonant ferromagnetic-piezoelectric magnetoelectric 2-2 composite sensor structures we find significant noise contributions of magnetic origin. Separating electrical and magnetic contributions from the piezoelectric, respectively ferromagnetic phases is essential for the optimization of composite magnetoelectric sensor structures working in the kHz to hundred MHz regime. Applying magneto-optical imaging under in-operando conditions on various timescales, the occurring magnetic effects can be evaluated.
Magnetic domain effects will be discussed on different types of 2-2 composite sensor structures. The examples include magnetic model structures, magnetically and electrically modulated, and surface acoustic wave sensor devices. Magnetic characterization is compared to electrical analysis. Conclusions for the further optimization of magnetoelectric sensors, especially of their noise characteristic, will be discussed.


Invited by Dr. Thomas Gemming und Dr. Andreas Winkler
Contact Brit Präßler-Wüstling

Wednesday 26.09.2018
IFW Kolloquium 15:00
Location Hörsaal, IFW Dresden A1E.10
Speaker Thomas Heine
Topic Where less is more: rational materials design with two-dimensional materials
Invited by Prof. Dr. Kornelius Nielsch
Contact Katja Schmiedel

Dresden Science Calendar

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