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HL: Fachverband Halbleiterphysik

HL 10: 2D Materials II – Electronic and transport properties (joint session HL/TT)

HL 10.5: Vortrag

Montag, 9. März 2026, 16:00–16:15, POT/0081

Polarization resolved Electron Spin Resonance in two-dimensional electron systems — •Daniiar Khudaiberdiev¹, Alexey Shuvaev¹, Michail Glazov², Anton Shchepetilnikov³, Viacheslav Muravev³, Christian Reichl⁴, Werner Wegscheider⁴, and Andrei Pimenov¹ — ¹Institute of Solid State Physics, Technische Universität Wien, 1040 Vienna, Austria — ²St. Petersburg, Russia — ³Chernogolovka, Russia — ⁴Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland

Electron spin resonance (ESR) has long served as a powerful probe of g-factor anisotropy, spin-orbit interactions, hyperfine coupling, and collective many-body spin phenomena in two-dimensional electron systems (2DESs). Most prior studies detect ESR in the photoresistance of Hall bars, where the excitation-field distribution and polarization are distorted, complicating the analysis of the excitation conditions.

In contrast, we report polarization-resolved ESR in sub-THz transmission using a quasi-optical setup and large-area samples that ensure high polarization purity. First we study the 2DES hosted in a 4.5-nm AlAs quantum well with a single isotropic valley. The selection rules indicate that Dresselhaus spin-orbit coupling mediates the electric-dipole-active spin absorption. Further we examine systems with more complex spectra such as wide AlAs wells with an active pseudospin, HgTe and InAs quantum wells with low effective mass and strong spin-orbit coupling enhancing the effects.

Keywords: Electric dipole spin resonance; Spin-orbit coupling; THz spectroscopy; Two-dimensional electron systems; Pseudospin