Document Type

Article

Publication Date

July 2019

Publication Title

Physical Review B

Volume

100

Issue Number

4

DOI

10.1103/PhysRevB.100.045125

ISSN

2469-9950

Keywords

Anisotropy, Charge density, Intelligent systems, Kinetic energy, Mean field theory, Monte Carlo methods, Strain, Temperature

Disciplines

Physics

Abstract

We investigate charge ordering in the Holstein model in the presence of anisotropic hopping, tx,ty=1-δ,1+δ, as a model of the effect of strain on charge-density-wave (CDW) materials. Using quantum Monte Carlo simulations, we show that the CDW transition temperature is relatively insensitive to moderate anisotropy δ 0.3, but begins to decrease more rapidly at δ 0.4. However, the density correlations, as well as the kinetic energies parallel and perpendicular to the compressional axis, change significantly for moderate δ. Accompanying mean-field theory calculations show a similar qualitative structure, with the transition temperature relatively constant at small δ, and a more rapid decrease for larger strains. We also obtain the density of states N(ω), which provides clear signal of the charge ordering transition at large strain, where finite size scaling of the charge structure factor is extremely difficult because of the small value of the order parameter. © 2019 American Physical Society.

Comments

SJSU users: Use the following link to login and access the article via SJSU databases.This article was published in the Physical Review B, volume 100, issue 4, 2019, and can also be found online here.Copyright © 2019, The American Physical Sociecty

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