Experimental measurements of effective mass in near-surface InAs quantum wells
Joseph Yuan, Mehdi Hatefipour, Brenden A. Magill, William Mayer, Matthieu Dartiailh, Kasra Sardashti, Kaushini S. Wickramasinghe, Giti A. Khodaparast, Yasuhiro H. Matsuda, Yoshimitsu Kohama, Zhuo Yang, Sunil Thapa, Christopher J. Stanton, Javad Shabani
Abstract
Near-surface indium arsenide quantum wells have recently attracted a great deal of interest since they can be interfaced epitaxially with superconducting films and have proven to be a robust platform for exploring mesoscopic and topological superconductivity. In this paper, we present magnetotransport properties of two-dimensional electron gases confined to an indium arsenide quantum well near the surface. The electron mass extracted from the envelope of the Shubnikov--de Haas oscillations shows an average effective mass ${m}^{*}=0.04$ at a low magnetic field. Complementary to our magnetotransport study, we employed cyclotron resonance measurements and extracted the electron effective mass in the ultrahigh magnetic-field regime. Both regimes can be understood by considering a model that includes nonparabolicity of the indium arsenide conduction bands.