GaN/AlGaN 2DEGs in the quantum regime: Magneto-transport and photoluminescence to 60 tesla

Crooker, Scott A.; Lee, Menyoung; McDonald, Ross David; Doorn, Jon L.; Zimmermann, Ingrid; Lai, Y.; Winter, L. E.; Ren, Y.; Cho, Y. -J.; Ramshaw, B. J.; Xing, H. Grace; Jena, Debdeep

doi:10.1063/5.0033047

GaN/AlGaN 2DEGs in the quantum regime: Magneto-transport and photoluminescence to 60 tesla

Journal Article · Sun Dec 27 23:00:00 EST 2020 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0033047· OSTI ID:1875797

^[1]; ^[2]; ^[1]; ^[1]; Zimmermann, Ingrid ^[1]; Lai, Y. ^[1]; ^[1]; Ren, Y. ^[2]; ^[2]; ^[2]; ^[2]; ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Cornell Univ., Ithaca, NY (United States)

Here, using high magnetic fields up to 60 T, we report magneto-transport and photoluminescence (PL) studies of a two-dimensional electron gas (2DEG) in a GaN/AlGaN heterojunction grown by molecular-beam epitaxy. Transport measurements demonstrate that the quantum limit can be exceeded (Landau level filling factor v<1) and show evidence for the v=2/3 fractional quantum Hall state. Simultaneous optical and transport measurements reveal synchronous quantum oscillations of both the PL intensity and the longitudinal resistivity in the integer quantum Hall regime. PL spectra directly reveal the dispersion of occupied Landau levels in the 2DEG and, therefore, the electron mass. These results demonstrate the utility of high (pulsed) magnetic fields for detailed measurements of quantum phenomena in high-density 2DEGs.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); Office of Naval Research (ONR)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1875797

Report Number(s):: LA-UR-20-27565

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 117; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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GaN/AlGaN 2DEGs in the quantum regime: Magneto-transport and photoluminescence to 60 tesla

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