Persistent current in a ring coupled to an external fermionic reservoir

Details Persistent current in a ring coupled to an external fermionic reservoir Persistent current in a ring coupled to an external fermionic reservoir

2003-09-23

arxiv.org/abs/cond-mat/0309527v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

this is a short version of cond-mat/0307136

Scientific paper

10.1016/j.physe.2003.12.019

We study the energy spectrum and the persistent current in an ideal one-dimensional mesoscopic ring coupled to a fermionic reservoir. We find that the tunnel coupling in general leads to the suppression of the persistent current. However, with increasing coupling, the effective level structure of the ring coupled to the reservoir changes and quasistates with a sharp eigenenergy develop. Depending on the number of ring states coupled to the reservoir this results in a nonzero persistent current even at very large tunneling between the ring and the reservoir.

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