Quantum coherence of the molecular states and their corresponding currents in nanoscale Aharonov-Bohm interferometers

Abstract

By considering a nanoscale Aharonov-Bohm (AB) interferometer containing a parrallel-coupled double dot coupled to the source and drain electrodes, we investigate the AB phase oscillations of transport current via the bonding and antibonding state channels. The results we obtained justify the experimental analysis given in [Phys. Rev. Lett. \textbf{106}, 076801 (2011)] that bonding state currents in different energy configurations are almost the same. On the other hand, we extend the analysis to the transient transport current components flowing through different channels, to explore the effect of the parity of bonding and antibonding states on the AB phase dependence of the corresponding current components in the transient regime. The relations of the AB phase dependence between the quantum states and the associated current components are analyzed in details, which provides useful information for the reconstruction of quantum states through the measurement of the transport current in such systems. With the coherent properties in the quantum dot states as well as in the transport currents, we also provide a way to manipulate the bonding and antibonding states by the AB magnetic flux.

10 pages, 7 figures

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• Counting statistics for electron capture in a dynamic quantum dot
• Magnetic field dependent transmission phase of a double dot system in a quantum ring
• Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots
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Cited by in corpus (6)

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• Buildup of Fano resonances in the time domain in a double quantum dot Aharonov-Bohm interferometer
• Nonequilibirum noise spectrum and Coulomb-blockade-assisted Rabi interference in a double-dot Aharonov-Bohm interferometer
• Exact dynamics and thermalization of open quantum systems coupled to reservoir through particle exchanges
• Master equation approach to transient quantum transport in nanostructures
• Aharonov Bohm Effect in Voltage Dependent Molecular Spin Dimer Switch