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Effects of domain walls on hole motion in the two-dimensional anisotropic t - J model at finite temperature

Effects of domain walls on hole motion in the two-dimensional anisotropic t - J model at finite... The t - J model on the square lattice, close to the t - J z limit, is studied by quantum Monte Carlo techniques at finite temperature and in the underdoped regime. A variant of the Hoshen-Koppelman algorithm was implemented to identify the antiferromagnetic domains on each Trotter slice. The results show that the model at high enough temperature presents finite antiferromagnetic (AF) domains, which collapse at lower temperatures into a single ordered AF state. While there are domains, holes would tend to preferentially move along the domain walls. In this case, there are indications of hole pairing starting at a relatively high temperature. At lower temperatures, when the whole system becomes essentially fully AF ordered, at least in finite clusters, holes would likely tend to move within phase separated regions. The crossover between both states moves down in temperature as doping increases and/or as the off-diagonal exchange increases. The possibility of hole motion along AF domain walls at zero temperature in the fully isotropic t - J is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Effects of domain walls on hole motion in the two-dimensional anisotropic t - J model at finite temperature

Riera, José A
Physical Review B , Volume 68 (5) – Aug 1, 2003
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References (31)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.68.054530
Publisher site
See Article on Publisher Site

Abstract

The t - J model on the square lattice, close to the t - J z limit, is studied by quantum Monte Carlo techniques at finite temperature and in the underdoped regime. A variant of the Hoshen-Koppelman algorithm was implemented to identify the antiferromagnetic domains on each Trotter slice. The results show that the model at high enough temperature presents finite antiferromagnetic (AF) domains, which collapse at lower temperatures into a single ordered AF state. While there are domains, holes would tend to preferentially move along the domain walls. In this case, there are indications of hole pairing starting at a relatively high temperature. At lower temperatures, when the whole system becomes essentially fully AF ordered, at least in finite clusters, holes would likely tend to move within phase separated regions. The crossover between both states moves down in temperature as doping increases and/or as the off-diagonal exchange increases. The possibility of hole motion along AF domain walls at zero temperature in the fully isotropic t - J is discussed.

Journal

Physical Review B – American Physical Society (APS)

Published: Aug 1, 2003

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