Charge Transfer Induced Persistent Current and Capacitance Oscillations

TL;DR

This paper explores how charge transfer in mesoscopic rings and quantum dots induces persistent current and capacitance oscillations, revealing new quantum effects and control mechanisms in nanoscale systems.

Contribution

It demonstrates how charge transfer affects persistent currents and capacitance oscillations, introducing novel quantum phenomena in mesoscopic systems.

Findings

Charge transfer causes persistent current plateaus with diamagnetic and paramagnetic states.

Sharp resonances in persistent current are independent of electron number in the dot.

External voltage and Aharonov-Bohm flux can polarize mesoscopic systems effectively.

Abstract

The transfer of charge between different regions of a phase-coherent mesoscopic sample is investigated. Charge transfer from a side branch quantum dot into a ring changes the persistent current through a sequence of plateaus of diamagnetic and paramagnetic states. In contrast, a quantum dot embedded in a ring exhibits sharp resonances in the persistent current, whose sign is independent of the number of electrons in the dot if the total number of electrons in the system is even. It is shown that such a mesoscopic system can be polarized appreciably not only by the application of an external voltage, but also via an Aharonov-Bohm flux.