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An interacting quantum dot inserted in an Aharonov-Bohm ring is investigated.The explicit expression of the ground-state energy and the persistent current of the system are obtained by a second-order variational perturbation approximation method.The numerical results of the Kondo temperature and the ground-state persistent current of the system are also given under the condition that the Coulomb repulsion is infinite.
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Keywords:
- Kondo effect /
- persistent current /
- variational method
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