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arXiv 0904.1509cond-mat.str-el
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量子临界点附近单粒子自由度与集体自由度的相互作用

Interplay of single-particle and collective degrees of freedom near the quantum critical point

V. A. Khodel, J. W. Clark, M. V. Zverev

摘要:

竞争方案的量子临界点(QCP)的强相互作用费米系统的状态在零温度下的发散密度的信号进行了对比。传统的情况下,它登记的集体模式的临界波动和属性的分歧一致消失的准粒子强度$z$,示出是不兼容的身份所产生的守恒定律在费米子介质。另一种情况下,在QCP的费米表面的拓扑结构被改变,被发现来解释实验观察到的非费米液体的热力学行为在Yb基化合物接近QCP。将拓扑方案与量子相变理论相结合,将为扩展QCP区的分析提供合适的基础。

英文摘要:

Competing scenarios for quantum critical points (QCPs) of strongly interacting Fermi systems signaled by a divergent density of states at zero temperature are contrasted. The conventional scenario, which enlists critical fluctuations of a collective mode and attributes the divergence to a coincident vanishing of the quasiparticle strength $z$, is shown to be incompatible with identities arising from conservation laws prevailing in the fermionic medium. An alternative scenario, in which the topology of the Fermi surface is altered at the QCP, is found to explain the non-Fermi-liquid thermodynamic behavior observed experimentally in Yb-based compounds close to the QCP. It is suggested that combination of the topological scenario with the theory of quantum phase transitions will provide a proper foundation for analysis of the extended QCP region.

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