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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/62563

Title: Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory
Author: SANVITO, STEFANO
AKANDE, AKINLOLU
Sponsor: 
Name Grant Number
SFI05/RFP/PHY0062
07/IN.1/I945

Author's Homepage: http://people.tcd.ie/sanvitos
http://people.tcd.ie/aakande
Keywords: Condensed matter physics
Thin films
Issue Date: 2012
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, 2012
Series/Report no.: Journal of Physics: Condensed Matter;
24;
5, 055602;
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.
Description: PUBLISHED
URI: http://hdl.handle.net/2262/62563
Related links: http://dx.doi.org/10.1088/0953-8984/24/5/055602
Appears in Collections:Physics (Scholarly Publications)

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