Scattering mechanisms in state-of-the-art GaAs/AlGaAs quantum wells

Huang, Yi; Shklovskii, B. I.; Zudov, M. A.

doi:10.1103/physrevmaterials.6.l061001

Scattering mechanisms in state-of-the-art GaAs/AlGaAs quantum wells

Journal Article · Fri Jun 24 00:00:00 EDT 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.l061001· OSTI ID:1980356

^[1]; Shklovskii, B. I. ^[2]; Zudov, M. A. ^[2]

University of Minnesota, Minneapolis, MN (United States); OSTI
University of Minnesota, Minneapolis, MN (United States)

Motivated by recent breakthroughs in molecular beam epitaxy of GaAs/AlGaAs quantum wells, we examine contributions to mobility and quantum mobility from various scattering mechanisms and their dependencies on the electron density. Here we find that at lower electron densities, n_e ≲ 1 x 10¹¹ cm^-2, both transport and quantum mobility are limited by unintentional background impurities and follow a power-law dependence, ∝ n$$^{α}_{e}$$, with α ≈ 0.85. Our predictions for quantum mobility are in reasonable agreement with an estimate obtained from the resistivity at filling factor ν = 1/2 in a sample of Y. J. Chung et al. with n_e = 1 x 10¹¹ cm^-2. Consideration of other scattering mechanisms indicates that interface roughness (remote donors) is likely a limiting factor of transport (quantum) mobility at higher electron densities. Future measurements of quantum mobility should yield information on the distribution of background impurities in GaAs and AlGaAs.

View Accepted Manuscript (DOE)

Research Organization:: University of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); William I. Fine Theoretical Physics Institute

Grant/Contract Number:: SC0002567

OSTI ID:: 1980356

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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