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Charge Stripes Due to Electron Correlations in the Two-Dimensional Spinless Falicov—Kimball Model
Authors:Lemański  R  Freericks  J K  Banach  G
Institution:1.Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroc?aw, Poland
;2.Department of Physics, Georgetown University, Washington, District of Columbia, 20057
;3.Daresbury Laboratory, Cheshire, WA4 4AD, Daresbury, United Kingdom
;
Abstract:We calculate the restricted phase diagram for the Falicov–Kimball model on a two-dimensional square lattice. We consider the limit where the average conduction electron density is equal to the average localized electron density, which is the limit related to the S z =0 states of the Hubbard model. After considering over 20,000 different candidate phases (with a unit cell of 16 sites or less) and their thermodynamic mixtures, we find only about 100 stable phases in the ground-state phase diagram, where the ground state is usually the phase separated mixture of two or three stable phases, that often have different electron densities than in the Maxwell-constructed mixture. We analyze these phases to describe where stripe phases occur and relate these discoveries (were appropriate) to the physics behind stripe formation in the Hubbard model.
Keywords:
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