Effect of Strong Orbital Magnetic Field on the Exciton Condensation in an Extended Falicov Kimball Model

27th IUPAP Conference on Computational Physics

物理学;计算机科学

Pradhan, S.^1 ; Taraphder, A.^1,2

Department of Physics, Indian Institute of Technology, Kharagpur W. B.

721302, India^1

Center for Theoretical Studies, Indian Institute of Technology, Kharagpur W. B.

721302, India^2

关键词: Applied magnetic fields;    Falicov-Kimball model;    Localized and itinerant electrons;    Order parameter;    Perpendicular magnetic fields;    Self-consistent mean-field theories;    Two-dimension;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/759/1/012032/pdf
DOI  :  10.1088/1742-6596/759/1/012032

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

A spinless, extended Falicov-Kimball model in the presence of a perpendicular magnetic field is investigated employing a self-consistent mean-field theory in two dimensions. In the presence of the field the excitonic average Δ =i†fi> is modified: the exciton responds in subtle different ways for different values of the magnetic flux. We examine the effects of Coulomb interaction and hybridization between the localized and itinerant electrons on the excitonic average, for rational values of the applied magnetic field. The excitonic average is found to get enhanced exponentially with the Coulomb interaction while it saturates at large hybridization. The orbital magnetic field suppresses the excitonic average in general, though a strong commensurability effect of the magnetic flux on the behaviour of the excitonic order parameter is observed.