Quantum Wire Network with Magnetic Flux

Details Quantum Wire Network with Magnetic Flux Quantum Wire Network with Magnetic Flux

2012-02-20

arxiv.org/abs/1202.4270v1

Physics

Condensed Matter

Strongly Correlated Electrons

LaTex, 13 pages, 14 figures

Scientific paper

The single channel transport properties of a quantum wire network in an ambient electromagnetic field are investigated. The network is made of three semi-infinite external leads connected to a ring which is crossed by a magnetic flux. Two different kinds of bulk dynamics, associated with the Schroedinger and Dirac equations, both minimally coupled to the external electromagnetic field, are analyzed. Connecting the external leads to heat reservoirs with different temperatures and/or chemical potentials, the system is driven away from equilibrium. We derive the conductance and the noise of this configuration, describing in details the impact of the magnetic flux. In the case of weak coupling between the ring and the reservoirs, a resonant tunneling effect is observed. We also discover a new power law behaviour of the pure thermal noise, which differs from the usual linear Johnson-Nyquist law when the magnetic flux is nonzero.

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