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Article: Electronic states and magnetotransport in quantum waveguides with nonuniform magnetic fields

TitleElectronic states and magnetotransport in quantum waveguides with nonuniform magnetic fields
Authors
KeywordsPhysics
Issue Date1997
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter), 1997, v. 56 n. 20, p. 13434-13441 How to Cite?
AbstractThe electronic states and magnetotransport properties of quantum waveguides (QW’s) in the presence of nonuniform magnetic fields perpendicular to the QW plane are investigated theoretically. It is found that the magnetoconductance of those structures as a function of Fermi energy exhibits stepwise variation or square-wave-like oscillations, depending on the specific distributions (both in magnitude and direction) of nonuniform magnetic fields in QW’s. We have investigated the dual magnetic strip structures and three magnetic strip structures. The character of the magnetotransport is closely related to the effective magnetic potential and the energy-dispersion spectrum of electron in the structures. It is found that dispersion relations seem to be combined by different sets of dispersion curves that belong to different individual magnetic subwaveguides. The magnetic effective potential leads to the coupling of states and the substantial distortion of the original dispersion curves at the interfaces in which the abrupt change of magnetic fields appears. Magnetic scattering states are created. Only in some three magnetic strip structures, these scattering states produce the dispersion relations with oscillation structures superimposed on the bulk Landau levels. It is the oscillatory behavior in dispersions that leads to the occurrence of square-wave-like modulations in conductance.
Persistent Identifierhttp://hdl.handle.net/10722/43250
ISSN
2001 Impact Factor: 3.07
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorGu, BYen_HK
dc.contributor.authorSheng, WDen_HK
dc.contributor.authorWang, XHen_HK
dc.contributor.authorWang, Jen_HK
dc.date.accessioned2007-03-23T04:42:11Z-
dc.date.available2007-03-23T04:42:11Z-
dc.date.issued1997en_HK
dc.identifier.citationPhysical Review B (Condensed Matter), 1997, v. 56 n. 20, p. 13434-13441en_HK
dc.identifier.issn0163-1829en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43250-
dc.description.abstractThe electronic states and magnetotransport properties of quantum waveguides (QW’s) in the presence of nonuniform magnetic fields perpendicular to the QW plane are investigated theoretically. It is found that the magnetoconductance of those structures as a function of Fermi energy exhibits stepwise variation or square-wave-like oscillations, depending on the specific distributions (both in magnitude and direction) of nonuniform magnetic fields in QW’s. We have investigated the dual magnetic strip structures and three magnetic strip structures. The character of the magnetotransport is closely related to the effective magnetic potential and the energy-dispersion spectrum of electron in the structures. It is found that dispersion relations seem to be combined by different sets of dispersion curves that belong to different individual magnetic subwaveguides. The magnetic effective potential leads to the coupling of states and the substantial distortion of the original dispersion curves at the interfaces in which the abrupt change of magnetic fields appears. Magnetic scattering states are created. Only in some three magnetic strip structures, these scattering states produce the dispersion relations with oscillation structures superimposed on the bulk Landau levels. It is the oscillatory behavior in dispersions that leads to the occurrence of square-wave-like modulations in conductance.en_HK
dc.format.extent184731 bytes-
dc.format.extent25600 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titleElectronic states and magnetotransport in quantum waveguides with nonuniform magnetic fieldsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0163-1829&volume=56&issue=20&spage=13434&epage=13441&date=1997&atitle=Electronic+states+and+magnetotransport+in+quantum+waveguides+with+nonuniform+magnetic+fieldsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.56.13434en_HK
dc.identifier.scopuseid_2-s2.0-0001553098-
dc.identifier.hkuros38940-
dc.identifier.isiWOS:A1997YH58800105-

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