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arXiv 0809.2857cond-mat.stat-mechcond-mat.other
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结构因子在量子相变中的临界行为

Critical Behaviour of Structure Factors at a Quantum Phase Transition

C. J. Hamer

摘要:

我们回顾了总的和一个粒子的结构因子在温度T=0的量子相变的理论行为。的横向伊辛模型,交替海森堡链,和双层海森堡模型的精确或数值结果的预测进行了比较。在临界波矢处,计算结果与理论预期基本一致。远离临界波矢,但是,不同的模型显示出相当不同的行为的单粒子残留物和结构因子。

英文摘要:

We review the theoretical behaviour of the total and one-particle structure factors at a quantum phase transition for temperature T=0. The predictions are compared with exact or numerical results for the transverse Ising model, the alternating Heisenberg chain, and the bilayer Heisenberg model. At the critical wavevector, the results are generally in accord with theoretical expectations. Away from the critical wavevector, however, different models display quite different behaviours for the one-particle residues and structure factors.

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