Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems

Vinicio Tarquini; Talbot Knighton; Zhe Wu; Jian Huang; Loren Pfeiffer; Ken West

doi:10.1063/1.4867086

Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems

Vinicio Tarquini, Talbot Knighton, Zhe Wu, Jian Huang, Loren Pfeiffer, Ken West

Research output: Contribution to journal › Article › peer-review

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Abstract

Quantum Hall measurement of two-dimensional high-mobility [μ∼2×106 cm2/(V·s)] hole systems confined in a 20 nm wide (100)-GaAs quantum well have been performed for charge densities between 4 and 5 × 10¹⁰ cm^-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_e in good agreement with previous cyclotron resonance results.

Original language	English (US)
Article number	092102
Journal	Applied Physics Letters
Volume	104
Issue number	9
DOIs	https://doi.org/10.1063/1.4867086
State	Published - Mar 3 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4867086

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title = "Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems",

abstract = "Quantum Hall measurement of two-dimensional high-mobility [μ∼2×106 cm2/(V·s)] hole systems confined in a 20 nm wide (100)-GaAs quantum well have been performed for charge densities between 4 and 5 × 1010 cm-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 me in good agreement with previous cyclotron resonance results.",

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T1 - Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems

AU - Tarquini, Vinicio

AU - Knighton, Talbot

AU - Wu, Zhe

AU - Huang, Jian

AU - Pfeiffer, Loren

AU - West, Ken

PY - 2014/3/3

Y1 - 2014/3/3

N2 - Quantum Hall measurement of two-dimensional high-mobility [μ∼2×106 cm2/(V·s)] hole systems confined in a 20 nm wide (100)-GaAs quantum well have been performed for charge densities between 4 and 5 × 1010 cm-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 me in good agreement with previous cyclotron resonance results.

AB - Quantum Hall measurement of two-dimensional high-mobility [μ∼2×106 cm2/(V·s)] hole systems confined in a 20 nm wide (100)-GaAs quantum well have been performed for charge densities between 4 and 5 × 1010 cm-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 me in good agreement with previous cyclotron resonance results.

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Degeneracy and effective mass in the valence band of two-dimensional (100)-GaAs quantum well systems

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