期刊
PHYSICAL REVIEW B
卷 88, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.125435
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-FG020-00- ER45841]
- Gordon and Betty Moore Foundation [GBMF2719]
- Keck Foundation, NSF [ECCS-1001719, DMR-1305691, MRSEC DMR-0819860]
- National Science Foundation [DMR-1157490]
- State of Florida
- U.S. Department of Energy
- DOE BES [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1305691] Funding Source: National Science Foundation
We demonstrate a severe Fermi contour anisotropy induced by the application of a parallel magnetic field to high-mobility electrons confined to a 30-nm-wide (001) GaAs quantum well. We study commensurability oscillations, namely, geometrical resonances of the electron orbits with a unidirectional, surface-strain-induced, periodic potential modulation, to directly probe the size of the Fermi contours along and perpendicular to the parallel field. Their areas are obtained from the Shubnikov-de Haas oscillations. Our experimental data agree semiquantitatively with the results of parameter-free calculations of the Fermi contours, but there are significant discrepancies.
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