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 G0 (G0 = 2e2/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 G0 but changes with electron density.
Original language | English |
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Pages (from-to) | 3000-3002 |
Number of pages | 3 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 40 |
Issue number | 4 B |
DOIs | |
Publication status | Published - 2001 Apr |
Externally published | Yes |
Keywords
- 0.7 G anomaly
- Back-gate
- Point contact
- Quantized conductance
- Undoped GaAs/AlGaAs single heterostructure
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)