Spontaneous and persistent currents in superconductive and mesoscopic structures

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dc.citation.epage534en_US
dc.citation.issueNumber7-8en_US
dc.citation.spage528en_US
dc.citation.volumeNumber30en_US
dc.contributor.authorKulik, I. O.en_US
dc.date.accessioned2018-04-12T13:44:00Z
dc.date.available2018-04-12T13:44:00Z
dc.date.issued2004en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe briefly review aspects of superconductive persistent currents in Josephson junctions of the S/I/S, S/O/S and S/N/S types, focusing on the origin of jumps in the current versus phase dependences, and discuss in more detail the persistent as well as «spontaneous» currents in the Aharonov-Bohm mesoscopic and nanoscopic (macromolecular) structures. A fixed-number-of- electrons mesoscopic or macromolecular conducting ring is shown to be unstable against structural transformation removing spatial symmetry (in particular, azimuthal periodicity) of its electron-lattice Hamiltonian. In case when the transformation is blocked by strong coupling to an external azimuthally symmetric environment, the system becomes bistable in its electronic configuration at certain number of electrons. At such a condition, the persistent current has a nonzero value even at the (almost) zero applied Aharonov-Bohm flux, and results in very high magnetic susceptibility dM/dH at small nonzero fields, followed by an oscillatory dependence at larger fields. We tentatively assume that previously observed oscillatory magnetization in cyclic metallo-organic molecules by Gatteschi et al. can be attributed to persistent currents. If this proves correct, it may open an opportunity (and, more generally, macromolecular cyclic structures may suggest the possibility) of engineering quantum computational tools based on the Aharonov-Bohm effect in ballistic nanostructures and macromolecular cyclic aggregates.en_US
dc.description.provenanceMade available in DSpace on 2018-04-12T13:44:00Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 179475 bytes, checksum: ea0bedeb05ac9ccfb983c327e155f0c2 (MD5) Previous issue date: 2004en
dc.identifier.eissn1090-6517
dc.identifier.issn1063-777X
dc.identifier.urihttp://hdl.handle.net/11693/38077
dc.language.isoEnglishen_US
dc.publisherAmerican Institute of Physicsen_US
dc.source.titleFizika Nizkikh Temperatur (Kharkov)en_US
dc.subjectComputational methodsen_US
dc.subjectElectronsen_US
dc.subjectHamiltoniansen_US
dc.subjectJosephson junction devicesen_US
dc.subjectMagnetic susceptibilityen_US
dc.subjectMagnetizationen_US
dc.subjectQuantum theoryen_US
dc.subjectMacromolecular conducting ringsen_US
dc.subjectMesoscopic structuresen_US
dc.subjectPersistent currentsen_US
dc.subjectSuperconducting materialsen_US
dc.titleSpontaneous and persistent currents in superconductive and mesoscopic structuresen_US
dc.typeReviewen_US

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