2002/01/21 by Kicheon Kang, Sam Young Cho, Kyoung Wan Park
Physics and Astronomy · #Quantum and electron transport phenomena #Quantum optics and atomic interactions #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.66.075312
4 pages, 4 figures
arxiv created 2002/01/21 · openalex publication_date 2002/08/05 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the persistent current in a hybrid Aharonov-Bohm ring--quantum-dot system coupled to a reservoir which provides spin fluctuations. It is shown that the spin exchange interaction between the quantum dot and the reservoir induces dephasing in the absence of direct charge transfer. We demonstrate an anomalous nature of this spin-fluctuation-induced dephasing which tends to enhance the persistent current. We explain our result in terms of the separation of the spin and the charge degrees of freedom. The nature of the spin-fluctuation-induced dephasing is analyzed in detail.