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          Institute: MPI für Physik Komplexer Systeme     Collection: Superconductivity and magnetism     Display Documents



ID: 479365.0, MPI für Physik Komplexer Systeme / Superconductivity and magnetism
From paramagnetic to diamagnetic charge and spin currents in a Hubbard necklace
Authors:Yi, J.; Cho, M. W.; Salk, S. H. S.
Language:English
Date of Publication (YYYY-MM-DD):2002-05-15
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Volume:65
Issue / Number:19
Sequence Number of Article:193108
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We investigate persistent charge and spin currents in a Hubbard necklace driven by Aharonov-Bohm and Aharonov-Casher (AC) fluxes, respectively, by paying specific attention to the roles of interactions affecting the charge and spin sectors in different ways. Interacting electrons at half filling induce "diamagnetic" spin currents at lower AC fluxes whereas charge currents display paramagnetic responses for noninteracting electrons. We find that for systems away from half filling the characteristic roles of spin and charge currents are interchanged, that is, the charge currents exhibit a change from paramagnetic to diamagnetic currents, while the spin currents remain "paramagnetic" states.
External Publication Status:published
Document Type:Article
Communicated by:Heidrun Näther
Affiliations:MPI für Physik Komplexer Systeme/Visitors Program
External Affiliations:Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany; Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany; Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea; Korea Inst Adv Study, Seoul, South Korea
Identifiers:ISI:000175860900008
ISSN:0163-1829
URL:http://ojps.aip.org/getabs/servlet/GetabsServlet?p...
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