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

Abstract

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 also 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. Furthermore, these results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems.

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [2];  [1];  [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Semiconsultants (Sweden)
  4. Univ. of Belgrade (Serbia)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Tohoku Univ., Sendai (Japan)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indian Space Research, Bangalore (India)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1224046
Alternate Identifier(s):
OSTI ID: 1235252
Report Number(s):
LA-UR-14-29633; SAND-2015-20726J
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:  
AC52-06NA25396; AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 3; Conference: CLEO 2015, MRS Spring 2015; April 6-10, 2015; San Francisco, California, US.; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Quantum wells; Electron states at surfaces and interfaces; Cyclotron resonance; Magneto-Optical THz spectroscopy; 43 PARTICLE ACCELERATORS; electron gas; magnetic fields; magnetooptical effects; effective mass; Landau levels

Citation Formats

Kamaraju, N., Pan, W., Ekenberg, U., Gvozdić, D. M., Boubanga-Tombet, S., Upadhya, P. C., Reno, J., Taylor, A. J., and Prasankumar, R. P. Terahertz magneto-optical spectroscopy of a two-dimensional hole gas. United States: N. p., 2015. Web. doi:10.1063/1.4906282.
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Kamaraju, N., Pan, W., Ekenberg, U., Gvozdić, D. M., Boubanga-Tombet, S., Upadhya, P. C., Reno, J., Taylor, A. J., & Prasankumar, R. P. Terahertz magneto-optical spectroscopy of a two-dimensional hole gas. United States. https://doi.org/10.1063/1.4906282
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Kamaraju, N., Pan, W., Ekenberg, U., Gvozdić, D. M., Boubanga-Tombet, S., Upadhya, P. C., Reno, J., Taylor, A. J., and Prasankumar, R. P. Wed . "Terahertz magneto-optical spectroscopy of a two-dimensional hole gas". United States. https://doi.org/10.1063/1.4906282. https://www.osti.gov/servlets/purl/1224046.
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@article{osti_1224046,
title = {Terahertz magneto-optical spectroscopy of a two-dimensional hole gas},
author = {Kamaraju, N. and Pan, W. and Ekenberg, U. and Gvozdić, D. M. and Boubanga-Tombet, S. and Upadhya, P. C. and Reno, J. and Taylor, A. J. and Prasankumar, R. P.},
abstractNote = {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 also 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. Furthermore, these results shed light on the properties of 2DHGs, motivating further studies of these unique 2D nanosystems.},
doi = {10.1063/1.4906282},
journal = {Applied Physics Letters},
number = 3,
volume = 106,
place = {United States},
year = {Wed Jan 21 00:00:00 EST 2015},
month = {Wed Jan 21 00:00:00 EST 2015}
}
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https://doi.org/10.1063/1.4906282
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    Terahertz quantum Hall effect for spin-split heavy-hole gases in strained Ge quantum wells
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