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

Kamaraju, N.; Pan, W.; Ekenberg, U.; Gvozdić, D. M.; Boubanga-Tombet, S.; Upadhya, P. C.; Reno, J.; Taylor, A. J.; Prasankumar, R. P.

doi:10.1063/1.4906282

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

Journal Article · Wed Jan 21 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4906282· OSTI ID:1224046

^[1]; Pan, W. ^[2]; Ekenberg, U. ^[3]; Gvozdić, D. M. ^[4]; Boubanga-Tombet, S. ^[5]; Upadhya, P. C. ^[6]; Reno, J. ^[2]; Taylor, A. J. ^[1]; Prasankumar, R. P. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Semiconsultants (Sweden)
Univ. of Belgrade (Serbia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Tohoku Univ., Sendai (Japan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indian Space Research, Bangalore (India)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396; AC04-94AL85000

OSTI ID:: 1224046

Alternate ID(s):: OSTI ID: 1235252

Report Number(s):: LA-UR-14-29633; SAND-2015-20726J; APPLAB

Journal Information:: Applied Physics Letters, Vol. 106, Issue 3; Conference: CLEO 2015, MRS Spring 2015; April 6-10, 2015; San Francisco, California, US.; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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References (28)

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