398 research outputs found
Coulomb blockade of non-local electron transport in metallic conductors
We consider a metallic wire coupled to two metallic electrodes via two
junctions placed nearby. A bias voltage applied to one of such junctions alters
the electron distribution function in the wire in the vicinity of another
junction thus modifying both its noise and the Coulomb blockade correction to
its conductance. We evaluate such interaction corrections to both local and
non-local conductances demonstrating non-trivial Coulomb anomalies in the
system under consideration. Experiments on non-local electron transport with
Coulomb effects can be conveniently used to test inelastic electron relaxation
in metallic conductors at low temperatures.Comment: Published version. 11 pages, 4 figures. New references added,
discussion and introduction are extended, appendices adde
Persistent current noise
We demonstrate that persistent current in meso- and nanorings may fluctuate
down to zero temperature provided the current operator does not commute with
the total Hamiltonian of the system. For a model of a quantum particle on a
ring we explicitly evaluate PC noise power which has a form of sharp peaks
which become broadened for multi-channel rings or in the presence of
dissipation. PC noise can be tuned by an external magnetic flux which is a
fundamental manifestation of quantum coherence in the system.Comment: 4 pages, 1 figur
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