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Aharonov-Bohm conductance through a single-channel quantum ring: persistent-current blockade and zero-mode dephasing.

A P Dmitriev¹, I V Gornyi, V Yu Kachorovskii

¹A.F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia.

Physical Review Letters

|September 28, 2010

Summary

Electron-electron interactions create unique resonances in quantum transport through a ring, driven by circular currents. These resonances persist even with thermal averaging, offering insights into quantum phenomena.

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Area of Science:

Quantum transport phenomena
Condensed matter physics
Mesoscopic systems

Background:

Understanding electron-electron interactions is crucial for predicting quantum transport behavior.
Tunnel-coupled single-channel rings are model systems for studying quantum coherence and interaction effects.

Purpose of the Study:

To investigate the influence of electron-electron interactions on transport properties of a tunnel-coupled single-channel ring.
To analyze the role of circular currents and their fluctuations in quantum transport.

Main Methods:

Theoretical modeling of electron transport through a quantum ring.
Analysis of conductance as a function of magnetic flux.
Investigating the impact of electron-electron interaction strength (α) on transport characteristics.

Main Results:

Observed interaction-induced resonances in conductance versus magnetic flux, surviving thermal averaging.
Determined the period of these resonances to be directly related to the interaction strength (α).
Identified circular current blocking as the primary mechanism for these resonances.

Conclusions:

Electron-electron interactions significantly modify transport properties in quantum rings.
Circular currents play a key role in blocking tunneling and generating observable resonances.
Dephasing is primarily caused by circular-current fluctuations and is independent of interaction strength.