Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: THz and MIR

HL 35.4: Vortrag

Mittwoch, 20. März 2024, 15:45–16:00, EW 203

Cyclotron and spin resonances in AlAs quantum wells — •Daniiar Khudaiberdiev — Institute of Solid State Physics, Vienna University of Technology, Vienna, 1040, Austria

Magneto-optical spectroscopy in THz range is a very useful technique for studying two-dimensional electron systems (2DESs). The main effect that is usually measured is the cyclotron resonance (CR), which gives the information on the cyclotron mass of the charged carriers, and thus, can be used to reconstruct the band structure in some cases [1]. Recently, a different method of measuring the effective mass was introduced [2]. This interferometric method gives the conductivity mass that, in contrast to the cyclotron mass, can be renormalized by the electron-electron interaction and also can be anisotropic. In this work we are using both methods to probe the AlAs quantum well system, which is well known for it*s anisotropic and heavy effective mass, and therefore, for it*s strong electron-electron interaction [3]. *In addition to the cyclotron resonance, the electron spin resonance (ESR) have also been observed in the system. Both of them are present in both photoresistance and transmission data. Direct observation of the ESR in the optical response provides an opportunity to study its polarization dependencies, that can give new information on its nature. [1] J. Gospodarič et al., Phys. Rev. B 104, 115307 (2021). [2] V. M. Muravev et al., Phys. Rev. Applied 19, 024039 (2023) [3] A. V. Shchepetilnikov et al., Phys. Rev. B 92, 161301(R) (2015).

Keywords: quantum well; electron spin resonance; cyclotron resonance