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Quantum Coherence Beyond the Thermal Length

S. E. J. Shaw·R. Fleischmann·E. J. Heller
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Abstract

Recent experiments have used scattering to map the flow of electrons in a two-dimensional electron gas. Among other things, the data from these experiments show perseverance of regular interference fringes beyond the kinematic thermal length. These fringes are seen in full quantum-mechanical simulations with thermal averaging, and within the phase coherence length they can also be understood with a simple, single-scattering model. This effect provides a new way to gauge the coherence length independent of thermal broadening. Appealing to higher-order scattering, we present a mechanism by which interference fringes may survive even beyond the phase coherence length.

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S. E. J. Shaw, R. Fleischmann, E. J. Heller. 2001-05-17. Quantum Coherence Beyond the Thermal Length. https://arxiv.org/abs/cond-mat/0105354

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