Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems
- Department of Physics and Astronomy, Wayne State University, 666 W. Hancock, Detroit, Michigan 48201 (United States)
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 (United States)
Quantum Hall measurement of two-dimensional high-mobility [μ∼2×10{sup 6} cm{sup 2}/(V·s)] hole systems confined in a 20 nm wide (100)-GaAs quantum well have been performed for charge densities between 4 and 5 × 10{sup 10} cm{sup −2} in a temperature range of 10–160 mK. The Fourier analysis of the Shubnikov-de Haas (SdH) oscillations of the magnetoresistance vs. the inverse of the magnetic field 1/B reveals a single peak, indicating a degenerate heavy hole (HH) band. The hole density p=(e/h)·f agrees with the Hall measurement result within 3%. The HH band degeneracy is understood through the diminishing spin-orbit interaction due to the low charge density and the nearly symmetric confinement. SdH oscillations fitted for 0.08 T ≤ B ≤ 0.24 T to the Dingle parameters yield an effective mass between 0.30 and 0.50 m{sub e} in good agreement with previous cyclotron resonance results.
- OSTI ID:
- 22283070
- Journal Information:
- Applied Physics Letters, Vol. 104, Issue 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Peculiarities of magnetoresistance in InSb whiskers at cryogenic temperatures
Two-band model for NbSe/sub 3/ (Ohmic regime)
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
CHARGE DENSITY
CYCLOTRON RESONANCE
EFFECTIVE MASS
ELECTRONIC STRUCTURE
FOURIER ANALYSIS
GALLIUM ARSENIDES
HOLE MOBILITY
HOLES
L-S COUPLING
MAGNETIC FIELDS
MAGNETORESISTANCE
OSCILLATIONS
QUANTUM WELLS
TEMPERATURE RANGE 0000-0013 K
TWO-DIMENSIONAL CALCULATIONS
VALENCE