Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Nonequilibrium Quantum Systems I (joint session TT/DY)
DY 30.2: Talk
Wednesday, March 11, 2026, 09:45–10:00, CHE/0091
Macroscopic mechanical torque for lattice and electronic chirality measurement — •Nikolai Peshcherenko1, Ning Mao1, Claudia Felser1, and Yang Zhang2,3 — 1Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany — 2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA — 3Min H. Kao Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996, USA
The concept of chirality is known to be critical for a number of phenomena related either to a structural asymmetry or topological electronic band crossings. In the present work we develop a robust chirality probe of TR-symmetric systems with mechanical torque measurement. Namely, we show that driving a system out of equilibrium with temperature gradient (or electric field to excite electrons) would result in uncompensated angular momentum and mechanical torque. Calculations are made for both phonons (insulating case) and electrons (metallic case) carrying angular momentum. For phonons, our theoretical findings stand in reasonable agreement with a recent experiment [1]. For electronic subsystem, we discuss both cases of structural and topological electronic chirality probe.
[1] H. Zhang, N. Peshcherenko, F. Yang, T. Ward, P.Raghuvanshi, L.Lindsay, C.Felser, Y.Zhang, J.-Q. Yan, H.Miao, Nat.Phys.1 (2025)
Keywords: Chiral crystals; Non-equilibrium chirality probe; Topological band crossings