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2001•Physical review. B, Condensed matterRequires access

Enhancement of the conductance-fluctuation amplitude in ballistic quantum cavities

Y. Takagaki, K. H. Ploog

Open publisher page 4 citations

Abstract

We numerically investigate the statistical properties of the conductance in quantum cavities when the electron transport is varied between the ballistic regime and the diffusive regime. The amplitude of conductance fluctuations in ballistic cavities is found to be by a factor of 2 larger than that in disordered conductors. The enhancement is accompanied with a negligible weak-localization correction to the average conductance. The origin of the anomalous behavior is identified to be the inefficiency of the scattering from cavity boundaries to achieve the Wigner-Dyson statistical properties.

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What this paper is about

We numerically investigate the statistical properties of the conductance in quantum cavities when the electron transport is varied between the ballistic regime and the diffusive regime. The amplitude of conductance fluctuations in ballistic cavities is found to be by a factor of 2 larger than that in disordered conductors. The enhancement is accompanied with a negligible weak-localization correction to the average conductance. The origin of the anomalous behavior is identified to be the inefficiency of the scattering from cavity boundaries to achieve the Wigner-Dyson statistical properties.

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Available abstract

We numerically investigate the statistical properties of the conductance in quantum cavities when the electron transport is varied between the ballistic regime and the diffusive regime. The amplitude of conductance fluctuations in ballistic cavities is found to be by a factor of 2 larger than that in disordered conductors. The enhancement is accompanied with a negligible weak-localization correction to the average conductance. The origin of the anomalous behavior is identified to be the inefficiency of the scattering from cavity boundaries to achieve the Wigner-Dyson statistical properties.

Key concepts: Conductance, Ballistic conduction, Physics, Amplitude, Conductance quantum, Condensed matter physics, Weak localization, Scattering

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