Quantum phase transitions in the interacting boson model:: Integrability, level repulsion, and level crossing -: art. no. 162502

被引：55
|
作者：
Arias, JM
Dukelsky, J
García-Ramos, JE
机构：
[1] Univ Sevilla, Fac Fis, Dept Fis Atom Mol & Nucl, E-41080 Seville, Spain
[2] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain
[3] Univ Huelva, Dept Fis Aplicada, Huelva 21071, Spain
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 16期
关键词：
D O I：
10.1103/PhysRevLett.91.162502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the quantum phase transition mechanisms that arise in the interacting boson model. We show that the second-order nature of the phase transition from U(5) to O(6) may be attributed to quantum integrability, whereas all the first-order phase transitions of the model are due to level repulsion with one singular point of level crossing. We propose a model Hamiltonian with a true first-order phase transition for finite systems due to level crossings.
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页数：4
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