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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|
|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≤t′/t≤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 2×2 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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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