Optimal topological test for degeneracies of real Hamiltonians -: art. no. 060406

被引：18
|
作者：
Johansson, N [1 ]
Sjöqvist, E [1 ]
机构：
[1] Univ Uppsala, Dept Quantum Chem, S-75120 Uppsala, Sweden
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 06期
关键词：
D O I：
10.1103/PhysRevLett.92.060406
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider adiabatic transport of eigenstates of real Hamiltonians around loops in parameter space. It is demonstrated that loops that map to nontrivial loops in the space of eigenbases must encircle degeneracies. Examples from Jahn-Teller theory are presented to illustrate the test. We show furthermore that the proposed test is optimal.
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页数：4
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