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High-temperature Aharonov-Bohm effect in transport through a single-channel quantum ring

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Abstract

We overview transport properties of an Aharonov-Bohm interferometer made of a single-channel quantum ring. Remarkably, in this setup, essentially quantum effects survive thermal averaging: the high-temperature tunneling conductance G of a ring shows sharp dips (antiresonances) as a function of magnetic flux. We discuss effects of the electron-electron interaction, disorder, and spin-orbit coupling on the Aharonov-Bohm transport through the ring. The interaction splits the dip into series of dips broadened by dephasing. The physics behind this behavior is the persistent-current-blockade: the current through the ring is blocked by the circular current inside the ring. Dephasing is then dominated by tunneling-induced fluctuations of the circular current. The short-range disorder broadens antiresonances, while the long-range one induces additional dips. In the presence of a spin-orbit coupling, G exhibits two types of sharp antiresonances: Aharonov-Bohm and Aharonov-Casher ones. In the vicinity of the antiresonances, the tunneling electrons acquire spin polarization, so that the ring serves as a spin polarizer.

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Authors and Affiliations

  1. Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia

    A. P. Dmitriev, I. V. Gornyi, V. Yu. Kachorovskii & P. M. Shmakov

  2. Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany

    A. P. Dmitriev, I. V. Gornyi, V. Yu. Kachorovskii & D. G. Polyakov

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  1. A. P. Dmitriev
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  2. I. V. Gornyi
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  3. V. Yu. Kachorovskii
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  4. D. G. Polyakov
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  5. P. M. Shmakov
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Correspondence to V. Yu. Kachorovskii.

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See the supplemental material for this paper on the JETP Letters site www.jetpletters.ac.ru. The article is published in the original.

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Dmitriev, A.P., Gornyi, I.V., Kachorovskii, V.Y. et al. High-temperature Aharonov-Bohm effect in transport through a single-channel quantum ring. Jetp Lett. 100, 839–851 (2015). https://doi.org/10.1134/S0021364014240059

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