Heterostructure design to achieve high quality, high density GaAs 2D electron system with g -factor tending to zero

Yoon Jang Chung, S. Yuan, Yang Liu, K. W. Baldwin, K. W. West, M. Shayegan, L. N. Pfeiffer

Research output: Contribution to journalArticle

Abstract

Hydrostatic pressure is a useful tool that can tune several key parameters in solid state materials. For example, the Landé g-factor in GaAs two-dimensional electron systems (2DESs) is expected to change from its bulk value g ≈ -0.44 to zero and even to positive values under sufficiently large hydrostatic pressure. Although this presents an intriguing platform to investigate electron-electron interaction in a system with g = 0, studies are quite limited because the GaAs 2DES density decreases significantly with increasing hydrostatic pressure. Here, we show that a simple model, based on pressure-dependent changes in the conduction band alignment, quantitatively explains this commonly observed trend. Furthermore, we demonstrate that the decrease in the 2DES density can be suppressed by more than a factor of 3 through an innovative heterostructure design.

Original languageEnglish (US)
Article number0013938
JournalApplied Physics Letters
Volume117
Issue number2
DOIs
StatePublished - Jul 13 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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