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

Journal Article · Mon Jan 19 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4906282· OSTI ID:22415130

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

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1. Sandia National Laboratories, Albuquerque, New Mexico 87123 (United States)
2. Semiconsultants, Brunnsgrnd 12, SE-18773 Täby (Sweden)
3. School of Electrical Engineering, University of Belgrade, Belgrade 11120 (Serbia)
4. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

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.

• OSTI ID: 22415130
• Journal Information: Applied Physics Letters, Vol. 106, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CYCLOTRON RESONANCE
ELECTRON GAS
HOLES
MAGNETIC FIELDS
QUANTUM COMPUTERS
QUANTUM MECHANICS
SPECTROSCOPY
THZ RANGE