Conductance quantization and the 0.7×2e2∕h conductance anomaly in one-dimensional hole systems
- 2 January 2006
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 88 (1) , 012107
- https://doi.org/10.1063/1.2161814
Abstract
We have studied ballistic transport in a one-dimensional (1D) channel formed using surface gate techniques on a back-gated, high-mobility, bilayer two-dimensional hole system. At millikelvin temperatures, robust conductance quantization is observed in the quantum wire formed in the top layer of the bilayer system, without the gate instabilities that have hampered previous studies of 1D hole systems. Using source drain bias spectroscopy, we have measured the 1D subband spacings, which are 5–10 times smaller than in comparable GaAs electron systems, but 2–3 times larger than in previous studies of 1D holes. We also report the first observation of the anomalous conductance plateau at G = 0.7 × 2 e 2 ∕ h in a 1D hole system.Keywords
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This publication has 21 references indexed in Scilit:
- Fano Factor Reduction on the 0.7 Conductance Structure of a Ballistic One-Dimensional WirePhysical Review Letters, 2004
- Nonlinear Response of a Clean One-Dimensional WirePhysical Review Letters, 2004
- Interaction Effects at Crossings of Spin-Polarized One-Dimensional SubbandsPhysical Review Letters, 2003
- Bias and temperature dependence of the 0.7 conductance anomaly in quantum point contactsPhysical Review B, 2000
- Controlled wave-function mixing in strongly coupled one-dimensional wiresPhysical Review B, 1999
- Fabrication of high mobility in situ back-gated (311)A hole gas heterojunctionsApplied Physics Letters, 1997
- Enhanced g factors of a one-dimensional hole gas with quantized conductancePhysical Review B, 1997
- Ballistic transport in one-dimensional constrictions formed in deep two-dimensional electron gasesApplied Physics Letters, 1995
- Phase coherence, interference, and conductance quantization in a confined two-dimensional hole gasPhysical Review B, 1994
- Nonlinear Quantum Conductance of a Lateral Microconstraint in a HeterostructureEurophysics Letters, 1989