Vincent Caudrelier, Mihail Mintchev, Eric Ragoucy
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.
View original:
http://arxiv.org/abs/1202.4270
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