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Phys. Rev. B 64, 033314 (2001) [4 pages]

Spin fluctuation and persistent current in a mesoscopic ring coupled to a quantum dot

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Sam Young Cho1,2, Kicheon Kang3, Chul Koo Kim1,2, and Chang-Mo Ryu4
1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
2Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-742, Korea
3Department of Physics, Chonbuk National University, Chonju 561-756, Korea
4Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea

Received 15 February 2001; published 29 June 2001

We investigate the persistent current influenced by the spin fluctuations in a mesoscopic ring weakly coupled to a quantum dot. It is shown that the Kondo effect gives rise to some unusual features of the persistent current in the limit where the charge transfer between two subsystems is suppressed. Various aspects of the crossover from a delocalized to a localized dot limit are discussed in relation with the effect of the coherent response of the Kondo cloud to the Aharonov-Bohm flux.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e033314
DOI: 10.1103/PhysRevB.64.033314
PACS: 73.23.Ra, 72.15.Qm, 73.23.Hk

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