Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-12-11
J. Phys.: Condens. Matter 10 (1998) 3985-4000
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages, 6 figures, uses iop style files, version as published
Scientific paper
10.1088/0953-8984/10/18/009
We investigate an ensemble of systems formed by a ring enclosing a magnetic flux. The ring is coupled to a side stub via a tunneling junction and via Coulomb interaction. We generalize the notion of level hybridization due to the hopping, which is naturally defined only for one-particle problems, to the many-particle case, and we discuss the competition between the level hybridization and the Coulomb interaction. It is shown that strong enough Coulomb interactions can isolate the ring from the stub, thereby increasing the persistent current. Our model describes a strictly canonical system (the number of carriers is the same for all ensemble members). Nevertheless for small Coulomb interactions and a long side stub the model exhibits a persistent current typically associated with a grand canonical ensemble of rings and only if the Coulomb interactions are sufficiently strong does the model exhibit a persistent current which one expects from a canonical ensemble.
Buttiker Markus
Cedraschi Pascal
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