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

被引：9

作者：

Kamaraju, N. ^{[1
]}

Pan, W. ^{[2
]}

Ekenberg, U. ^{[3
]}

Gvozdic, D. M. ^{[4
]}

Boubanga-Tombet, S. ^{[1
,5
]}

Upadhya, P. C. ^{[1
,6
]}

Reno, J. ^{[2
]}

Taylor, A. J. ^{[1
]}

Prasankumar, R. P. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA

[2] Sandia Natl Labs, Albuquerque, NM 87123 USA

[3] Semiconsultants, SE-18773 Taby, Sweden

[4] Univ Belgrade, Sch Elect Engn, Belgrade 11120, Serbia

[5] Tohoku Univ, Elect Commun Res Inst, Aoba Ku, Sendai, Miyagi 980, Japan

[6] Indian Space Res Org, Lab Electroopt Syst, Bangalore 560058, Karnataka, India

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 03期

关键词：

CYCLOTRON-RESONANCE; ELECTRON-GAS; HETEROSTRUCTURES; LINEWIDTH;

D O I：

10.1063/1.4906282

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2015 AIP Publishing LLC.

引用

页数：4

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