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Controlling local currents in molecular junctions

Yadalam, Hari Kumar and Harbola, Upendra (2016) Controlling local currents in molecular junctions. In: PHYSICAL REVIEW B, 94 (11).

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Official URL: http://dx.doi.org/10.1103/PhysRevB.94.115424


The effects of nonequilibrium constraints and dephasing on the circulating currents in molecular junctions are analyzed. Circulating currents are manifestations of quantum effects and can be induced either by externally applied bias or an external magnetic field through the molecular system. In a symmetric Aharonov-Bohm ring, bond currents have two contributions, bias driven and magnetic field driven. We analyze the competition between these two contributions and show that, as a consequence, current through one of the branches can be completely suppressed. We then study the effect of asymmetry (as a result of chemical substitution) on the current pathways inside the molecule and study asymmetry-induced circulating currents (without magnetic field) by tuning the coupling strength of the substituent (at finite bias).

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 28 Oct 2016 07:14
Last Modified: 28 Oct 2016 07:14
URI: http://eprints.iisc.ac.in/id/eprint/55144

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