Hartree-Fock calculations of a finite inhomogeneous quantum wire

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Hartree-Fock calculations of a finite inhomogeneous quantum wire

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dc.contributor.author Qian, Jiang
dc.contributor.author Halperin, Bertrand
dc.date.accessioned 2009-05-01T18:46:52Z
dc.date.issued 2008
dc.identifier.citation Qian, Jiang and Bertrand I Halperin. 2008. Hartree-Fock calculations of a finite inhomogeneous quantum wire. Physical Review B 77(8): 085314. en
dc.identifier.issn 1098-0121 en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:2887035
dc.description.abstract We use the Hartree-Fock method to study an interacting one-dimensional electron system on a finite wire, partially depleted at the center by a smooth potential barrier. A uniform 1 T Zeeman field is applied throughout the system. We find that with the increase in the potential barrier, the low density electrons under it go from a nonmagnetic state to an antiferromagnetic state and then to a state with a well-localized spin-aligned region isolated by two antiferromagnetic regions from the high density leads. At this final stage, in response to a continuously increasing barrier potential, the system undergoes a series of abrupt density changes, corresponding to the successive expulsion of a single electron from the spin-aligned region under the barrier. Motivated by the recent momentum-resolved tunneling experiments in a parallel wire geometry, we also compute the momentum-resolved tunneling matrix elements. Our calculations suggest that the eigenstates being expelled are spatially localized, consistent with the experimental observations. However, additional mechanisms are needed to account for the experimentally observed large spectral weight near k=0 in the tunneling matrix elements. en
dc.description.sponsorship Physics en
dc.language.iso en_US en
dc.publisher The American Physical Society en
dc.relation.isversionof http://dx.doi.org/10.1103/PhysRevB.77.085314 en
dash.license LAA
dc.subject quantum wires en
dc.subject magnetic tunnelling en
dc.subject spin polarised transport en
dc.subject Zeeman effect en
dc.subject HF calculations en
dc.title Hartree-Fock calculations of a finite inhomogeneous quantum wire en
dc.relation.journal Physical Review B en
dash.depositing.author Halperin, Bertrand

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  • FAS Scholarly Articles [7362]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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