Conductance quantization and shot noise of a double-layer quantum point contact

D. Terasawa, S. Norimoto, T. Arakawa, M. Ferrier, A. Fukuda, K. Kobayashi, and Y. Hirayama
Phys. Rev. B 101, 115401 – Published 2 March 2020

Abstract

The conductance quantization and shot noise below the first conductance plateau G0=2e2/h are measured in a quantum point contact fabricated in a GaAs/AlGaAs tunnel-coupled double quantum well. From the conductance measurement, we observe a clear quantized conductance plateau at 0.5G0 and a small minimum in the transconductance at 0.7G0. Spectroscopic transconductance measurement reveals three maxima inside the first diamond, thus suggesting three minima in the dispersion relation for electric subbands. Shot noise measurement shows that the Fano factor behavior is consistent with this observation. We propose a model that relates these features to a wave-number directional split subband due to a strong Rashba spin-orbit interaction that is induced by the center barrier potential gradient of the double-layer sample.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
9 More
  • Received 10 April 2019
  • Revised 24 January 2020
  • Accepted 9 February 2020

DOI:https://doi.org/10.1103/PhysRevB.101.115401

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

D. Terasawa1,*, S. Norimoto2, T. Arakawa2,3, M. Ferrier2,4, A. Fukuda1, K. Kobayashi2,5, and Y. Hirayama6

  • 1Department of Physics, Hyogo College of Medicine, Nishinomiya 663-8501, Japan
  • 2Graduate School of Science, Department of Physics, Osaka University, Toyonaka 560-0043, Japan
  • 3Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 4Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris Saclay, 91405 Orsay Cedex, France
  • 5Institute for Physics of Intelligence and Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
  • 6Graduate School of Science and CSIS, Tohoku University, Sendai 980-8578, Japan

  • *terasawa@hyo-med.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 101, Iss. 11 — 15 March 2020

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×