Back-Gated Point Contact
- 1 April 2001
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 40 (4S), 3000-3002
- https://doi.org/10.1143/jjap.40.3000
Abstract
In this study, we fabricated split gates on a back-gated undoped heterostructure to perform transport measurements on a quantum point contact (QPC). Using this back-gated QPC system, we obtained clear quantized conductance plateaus over a wide range of electron densities (1.2×1015 m-2 to 3.3×1015 m-2) without being affected by imperfections. We also observed a clear 0.7 G 0 (G 0=2e 2/h) anomaly. The shape of the anomaly varies with electron density. Furthermore, the conductance value at which this anomaly appears is not precisely 0.7 G 0 but changes with electron density.Keywords
This publication has 9 references indexed in Scilit:
- Quantum Point Contacts in a Density-Tunable Two-Dimensional Electron GasJapanese Journal of Applied Physics, 2000
- Spin properties of low-density one-dimensional wiresPhysical Review B, 2000
- Possible mechanism of the fractional-conductance quantization in a one-dimensional constrictionPhysical Review B, 2000
- Fabrication of high-quality one- and two-dimensional electron gases in undoped GaAs/AlGaAs heterostructuresApplied Physics Letters, 1999
- Interaction effects in a one-dimensional constrictionPhysical Review B, 1998
- High-Mobility Two-Dimensional Electron Gas in an Undoped Heterostructure: Mobility Enhancement after IlluminationJapanese Journal of Applied Physics, 1998
- Spin splitting of subbands in quasi-one-dimensional electron quantum channelsPhysical Review B, 1996
- Possible Spin Polarization in a One-Dimensional Electron GasPhysical Review Letters, 1996
- Quantized conductance of point contacts in a two-dimensional electron gasPhysical Review Letters, 1988