Quantum Spin Glasses

Quantum Spin Glasses
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量子自旋玻璃

DOI:
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发表时间:
1996
期刊:
影响因子:
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通讯作者:
A. Young
A. Young
中科院分区:
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文献类型:
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作者:
H. Rieger;A. Young

文献摘要

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横场中的伊辛自旋玻璃呈现零温度量子相变,这种相变是由量子涨落而不是热涨落驱动的。它们构成了一个普适类,与经典的热相变有很大的不同。最有趣的是,在有限维中,量子格里菲斯相导致了各种物理量的严重后果:例如,在无序相中的整个横向场值范围内,可以观察到发散的磁极化率。
Ising spin glasses in a transverse field exhibit a zero temperature quantum phase transition, which is driven by quantum rather than thermal fluctuations. They constitute a universality class that is significantly different from the classical, thermal phase transitions. Most interestingly close to the transition in finite dimensions a quantum Griffiths phase leads to drastic consequences for various physical quantities: for instance diverging magnetic susceptibilities are observable over a whole range of transverse field values in the disordered phase.