Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory
Citation:
A. Akande and S. Sanvito, Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory, Journal of Physics: Condensed Matter, 24, 5, 055602, 2012Download Item:
Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory.pdf (Published (publisher's copy) - Peer Reviewed) 1002.Kb
Abstract:
The Bethe ansatz local density approximation (LDA) to lattice density functional theory (LDFT) for the one-dimensional repulsive Hubbard model is extended to current-LDFT (CLDFT). The transport properties of mesoscopic Hubbard rings threaded by a magnetic flux are then systematically investigated by this scheme. In particular we present calculations of ground state energies, persistent currents and Drude weights for both a repulsive homogeneous and a single impurity Hubbard model. Our results for the ground state energies in the metallic phase compare favorably well with those obtained with numerically accurate many-body techniques. Also the dependence of the persistent currents on the Coulomb and the impurity interaction strength, and on the ring size are all well captured by LDA-CLDFT. Our study demonstrates the value of CLDFT in describing the transport properties of one-dimensional correlated electron systems. As its computational overheads are rather modest, we propose this method as a tool for studying problems where both disorder and interaction are present.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
SFI05/RFP/PHY0062
Science Foundation Ireland (SFI)
07/IN.1/I945
Author's Homepage:
http://people.tcd.ie/sanvitoshttp://people.tcd.ie/aakande
Description:
PUBLISHED
Author: SANVITO, STEFANO; AKANDE, AKINLOLU
Type of material:
Journal ArticleCollections:
Series/Report no:
Journal of Physics: Condensed Matter24
5, 055602
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Full text availableKeywords:
Condensed matter physics, Thin filmsSubject (TCD):
Nanoscience & MaterialsLicences: