Back-gated point contact

Katsushi Hashimoto, Sen Miyashita, Tadashi Saku, Yoshiro Hirayama

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


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 languageEnglish
Pages (from-to)3000-3002
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number4 B
Publication statusPublished - 2001 Apr


  • 0.7 G anomaly
  • Back-gate
  • Point contact
  • Quantized conductance
  • Undoped GaAs/AlGaAs single heterostructure


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