FINITE TEMPERATURE APPROACH TO QUANTUM PHASE TRANSITIONS

被引：2

作者：

Plastino, A. ^{[1
,2
]}

Curado, E. M. F. ^{[3
]}

机构：

[1] Natl Univ La Plata, Exact Sci Fac, RA-1900 La Plata, Argentina

[2] Consejo Nacl Invest Cient & Tecn, CCT, RA-1900 La Plata, Argentina

[3] CBPF, Rio De Janeiro, Brazil

来源：

INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS | 2010年 / 20卷 / 02期

关键词：

Quantum phase transitions; statistical mechanics; specific heat; fluctuations; correlations;

D O I：

10.1142/S0218127410025855

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

We show how ordinary, finite-temperature tools of Statistical Mechanics can be used to detect quantum phase transitions in many-body systems. In particular, statistical correlations exhibit a quite idiosyncratic behavior at the critical interaction-strengths. Moreover, what one may call "soft quantum phase-transitions" (crossings of excited states) are characterized by the rather special way of vanishing that these correlations adopt.

引用

页码：397 / 401

页数：5

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