skip to main content

This content will become publicly available on January 21, 2016

Title: 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 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]
  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:
OSTI Identifier:
1224046
Report Number(s):
LA-UR-14-29633; SAND-2015-20726J
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:
AC52-06NA25396; AC04-94AL85000
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)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
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