Breakdown of correlated diffusion in quasiballistic quantum wires at high magnetic fields

J. P. Bird, K. Ishibashi, Y. Ochiai, M. Lakrimi, A. D. C. Grassie, K. M. Hutchings, Y. Aoyagi, and T. Sugano
Phys. Rev. B 52, 1793 – Published 15 July 1995
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Abstract

We study the universal conductance fluctuations (UCF) observed in the low-temperature magnetoconductance of high-mobility GaAs/AlxGa1xAs quantum wires. As the magnetic field is increased, such that the cyclotron orbit becomes smaller than the wire width, both the amplitude δg and correlation field Bc of the fluctuations are found to increase linearly with magnetic field. The linear increase in Bc is in agreement with the results of recent nonlocal studies of the UCF, and is thought to demonstrate a transition to edge-related transport. Similarly, the increase in δg is argued to result from a magnetically induced breakdown of correlated diffusion, which occurs as the edge states begin to be resolved. Such a breakdown was not observed in previous studies of dirty wires, in which the electron motion remains diffusive up to very high fields, but is instead thought to result from the quasiballistic nature of the wires we study.

  • Received 23 January 1995

DOI:https://doi.org/10.1103/PhysRevB.52.1793

©1995 American Physical Society

Authors & Affiliations

J. P. Bird and K. Ishibashi

  • Nanoelectronics Materials Laboratory, Frontier Research Program, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-01, Japan

Y. Ochiai

  • Department of Materials Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263, Japan

M. Lakrimi and A. D. C. Grassie

  • School of Mathematical & Physical Sciences, University of Sussex, Brighton BN1 9QH, United Kingdom

K. M. Hutchings

  • Philips Research Laboratories, Cross Oak Lane, Redhill, Surrey RH1 5HA, United Kingdom

Y. Aoyagi and T. Sugano

  • Nanoelectronics Materials Laboratory, Frontier Research Program, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-01, Japan

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Vol. 52, Iss. 3 — 15 July 1995

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