Suppression of level hybridization due to Coulomb interactions
Abstract
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. It is also shown that the topology chosen can be used to mimic a canonical as well as a grand canonical ensemble of rings and that the Coulomb interaction reduces the difference between the two.Keywords
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