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High-temperature shot noise in the single-channel Aharonov--Bohm interferometer
Niyazov R. A.
1,2, Krainov I. V.1, Aristov D. N.1,2,3, Kachorovskii V. Y.1
1Ioffe Institute, St. Petersburg, Russia
2Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre «Kurchatov Institute» (NRC «Kurchatov Institute» - PNPI), Gatchina, Leningradskaya Oblast, Russia
3St. Petersburg State University, St. Petersburg, Russia
2Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre «Kurchatov Institute» (NRC «Kurchatov Institute» - PNPI), Gatchina, Leningradskaya Oblast, Russia
3St. Petersburg State University, St. Petersburg, Russia
Email: niyazov_ra@pnpi.nrcki.ru
Shot noise is theoretically investigated in Aharonov-Bohm interferometers formed by single-channel spinless quantum wires. Analysis focuses on the experimentally important regime of relatively high temperatures, where thermal energy exceeds the level spacing. It is shown that quantum interference effects dramatically alter current fluctuations even when coherence suppression might be expected. The Fano factor - the ratio of shot noise power to Schottky noise - is demonstrated to exhibit sharp, periodically repeating resonances as a function of magnetic flux. For symmetric interferometers, these resonances occur at half-integer flux quanta, while geometric asymmetry leads to additional features at integer flux values. It is found that interferometers with different contact configurations can possess identical conductance but substantially different noise characteristics, enabling experimental determination of contact properties through combined measurements of conductance and noise. The obtained results allow for direct experimental verification and propose noise spectroscopy and characterization of mesoscopic devices as a powerful tool complementary to conductance measurements. Keywords: Aharonov-Bohm effect, Shot noise, Mesoscopic physics, Quantum interferometry, Fano factor.
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