Cited by 810Quantum and electron transport phenomenaQuantum chaos and dynamical systemsSurface and Thin Film Phenomena

Aharonov-Bohm effect in normal metal quantum coherence and transport

Washburn, Sean, Webb, Richard A.·1986·Advances in Physics

Abstract

We review some of the recent surprising theoretical and experimental results obtained on the transport properties of small disordered metal samples. Even in the presence of disorder, the quantum mechanical interference of electron wavefunctions can still be observed. The Aharonov-Bohm effect is a particularly clear demonstration of this. In doubly connected structures (such as loops of wire) threaded by a magnetic flux, the electrical conductance oscillates because of the Aharonov-Bohm effect. In fact, because the electron trajectories are diffusive (i.e. random walks), even a lone wire (a singly connected structure) will exhibit a random pattern of conductance fluctuations as a function of the magnetic field because of the same interference effects. All that is required for the observation of these interferences is that the electrons retain ‘phase memory’ duing the period of transit through the sample. The length over which memory is maintained (the phase coherence length) can be much larger than the random walk step length (the mean free path). We focus mainly on effects observed in the limit where the phase coherence length of the electrons is comparable to or larger than the sample size. We explain how the interferences are averaged as the system size grows larger than the phase coherence length. We also remark on surprising aspects of the fluctuations such as those resulting from the non-local character of the wavefunction; some of the results are forbidden classically.

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Crossref · 10.1080/00018738600101921

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  • For an electron traversing a gold wire at temperatures less than 1 K, the dephasing time t_phi is of order 10^-13 seconds.

    “For example, for the state of an electron traversing a gold wire at temperatures less than 1K, t φ is of order 10 -13 seconds.”

    From Two-bit gates are universal for quantum computation (1995) · cites this paper as [7]

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Authors
Washburn, S., & Webb, R. A.
Affiliations
IBM (United States) (US)
Venue
Advances in Physics
Published
1986-01
Volume
35
Issue
4
Pages
375-422
ISSN
  • 0001-8732 (ISSN-L)
  • 1460-6976
OpenAlex
W2027572134
Cited by
810
References
119
Citations by year
2026: 6 · 2025: 11 · 2024: 4 · 2023: 9 · 2022: 9 · 2021: 11 · 2020: 8 · 2019: 12 · 2018: 13 · 2017: 9 · 2016: 11 · 2015: 10 · 2014: 7 · 2013: 12 · 2012: 13
FWCI
27.68
Type
journal article
Language
en
Open access
closed
Locations
Advances In Physics (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Quantum chaos and dynamical systems
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Surface and Thin Film Phenomena
Keywords
Aharonov-Bohm effect, quantum interference, disordered metals, conductance fluctuations, phase coherence length, quantum coherence, magnetic flux, mesoscopic transport, conductance oscillations

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