Bohm-Aharonov and Kondo effects on tunneling currents in a mesoscopic ring
- Departamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro, Caixa Postal 38071, 22452-970 Rio de Janeiro, Rio de Janeiro, (Brasil)
- Instituto de Fisica, Universidade Federal Fluminense, Niteroi, RJ Brasil, Avenida Litoranea s/n, Gragoata, 24210-340 Niteroi, Rio de Janeiro, (Brasil)
- Instituto de Fisica, Univerisdade Federal do Rio Grande do Sul, Caixa Postal 15051, 91501-970, Porto Alegre, Rio Grande do Sul, (Brasil)
- Departamento de Fisica, Universidad de Buenos Aires, Caixa Postal 1428-Nunez, Buenos Aires (Argentina)
We present an analysis of the Kondo effect on the Bohm-Aharonov oscillations of the tunneling currents in a mesoscopic ring with a quantum dot inserted in one of its arms. The system is described by an Anderson-impurity tight-binding Hamiltonian where the electron-electron interaction is restricted to the dot. The currents are obtained using nonequilibrium Green functions calculated through a cumulant diagrammatic expansion in the chain approximation. It is shown that at low temperature, even with the system out of resonance, the Kondo peak provides a channel for the electron to tunnel through the dot, giving rise to the Bohm-Aharonov oscillations of the current. At high temperature these oscillations are important only if the dot level is aligned to the Fermi level, when the resonance condition is satisfied. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 535721
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 12; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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