Terahertz magneto-optical spectroscopy of a two-dimensional hole gas

Two-dimensional hole gases (2DHGs) have attracted recent attention for their unique quantum physics and potential applications in areas including spintronics and quantum computing. However, their properties remain relatively unexplored, motivating the use of different techniques to study them. We us...

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Veröffentlicht in:Applied physics letters 2015-01, Vol.106 (3)
Hauptverfasser: Kamaraju, N., Pan, W., Ekenberg, U., Gvozdić, D. M., Boubanga-Tombet, S., Upadhya, P. C., Reno, J., Taylor, A. J., Prasankumar, R. P.
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container_issue 3
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container_title Applied physics letters
container_volume 106
creator Kamaraju, N.
Pan, W.
Ekenberg, U.
Gvozdić, D. M.
Boubanga-Tombet, S.
Upadhya, P. C.
Reno, J.
Taylor, A. J.
Prasankumar, R. P.
description Two-dimensional hole gases (2DHGs) have attracted recent attention for their unique quantum physics and potential applications in areas including spintronics and quantum computing. However, their properties remain relatively unexplored, motivating the use of different techniques to study them. We used terahertz magneto-optical spectroscopy to investigate the cyclotron resonance frequency in a high mobility 2DHG, revealing a nonlinear dependence on the applied magnetic field. This is shown to be due to the complex non-parabolic valence band structure of the 2DHG, as verified by multiband Landau level calculations. We also find that impurity scattering dominates cyclotron resonance decay in the 2DHG, in contrast with the dominance of superradiant damping in two-dimensional electron gases. Our results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems.
doi_str_mv 10.1063/1.4906282
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source American Institute of Physics (AIP) Journals; Alma/SFX Local Collection
subjects Applied physics
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Cyclotron resonance
Damping
Dependence
effective mass
electron gas
Electron states at surfaces and interfaces
Landau levels
magnetic fields
Magnetic resonance
Magneto-Optical THz spectroscopy
magnetooptical effects
MATERIALS SCIENCE
PARTICLE ACCELERATORS
Quantum computing
Quantum theory
Quantum wells
Resonance scattering
Spectrum analysis
Spintronics
Valence band
title Terahertz magneto-optical spectroscopy of a two-dimensional hole gas
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