Correlations at a quantum phase transition in interacting Bose systems

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We have investigated the correlation functions of interacting bosons at the generic superfluid-insulator transition, a prototypical quantum phase transition, in two dimensions in the spherical limit. Unexpectedly the spatial correlation functions show non-power-law behavior consisting of two parts: short-range correlation due to the particle-hole pair excitations and long-range off-diagonal order due to the single-particle condensation. The temporal correlation functions, on the other hand, show power-law behavior.
10 pages, 6 figures

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Strongly Correlated Electrons, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/26441

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0505752
 http://arxiv.org/abs/cond-mat/0505752

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arXiv