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Type: Artigo de periódico
Title: Qualitative understanding of the sign of t ' asymmetry in the extended t-J model and relevance for pairing properties
Author: Martins, GB
Xavier, JC
Arrachea, L
Dagotto, E
Abstract: Numerical calculations illustrate the effect of the sign of the next-nearest-neighbor hopping term t' on the two-hole properties of the t-t'-J model. Working mainly on two-leg ladders, in the -1.0 less than or equal to t'/t less than or equal to 1.0 regime, it is shown that introducing t' in the t-J model is equivalent to effectively renormalizing J, namely t' negative (positive) is equivalent to an effective t-J model with smaller (bigger) J. This effect is present even at the level of a 2 x 2 plaquette toy model. and was observed also in calculations on small square clusters. Analyzing the transition probabilities of a hole pair in the plaquette toy model, it is argued that the coherent propagation of such hole pair is enhanced by a constructive interference between both t and t' for t' > 0. This interference is destructive for t' < 0.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.64.180513
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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