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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/13475
Title: An extended Falicov-Kimball model on a triangular lattice
Authors: Yadav U.K.
Maitra T.
Singh I.
Taraphder A.
Published in: EPL
Abstract: The combined effect of frustration and correlation in electrons is a matter of considerable interest lately. In this context a Falicov-Kimball model on a triangular lattice with two localized states, relevant for certain correlated systems, is considered. Making use of the local symmetries of the model, our numerical study reveals a number of orbital ordered ground states, tuned by the small changes in parameters while quantum fluctuations between the localized and extended states produce homogeneous mixed valence. The inversion symmetry of the Hamiltonian is broken by most of these ordered states leading to orbitally driven ferroelectricity. We demonstrate that there is no spontaneous symmetry breaking when the ground state is inhomogeneous. The study could be relevant for frustrated systems like GdI2, NaTiO2 (in its low-temperature C2/m phase) where two Mott localized states couple to a conduction band. Copyright © EPLA, 2011.
Citation: EPL (2011), 93(4): -
URI: https://doi.org/10.1209/0295-5075/93/47013
http://repository.iitr.ac.in/handle/123456789/13475
Issue Date: 2011
ISSN: 2955075
Author Scopus IDs: 36182569400
7004183343
57206594996
6602698909
Author Affiliations: Yadav, U.K., Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
Maitra, T., Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
Singh, I., Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
Taraphder, A., Department of Physics, Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur-721302, India
Corresponding Author: Yadav, U. K.; Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
Appears in Collections:Journal Publications [PH]

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