Charge density wave and superconductivity in the disordered Holstein model
Charge density wave and superconductivity in the disordered Holstein model
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DOI：
10.1103/physrevb.103.l060501
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发表时间：
2019-10
影响因子：
3.7
通讯作者：
Bo Xiao;N. Costa;E. Khatami;G. Batrouni;R. Scalettar
中科院分区：
文献类型：
--
作者：
Bo Xiao;N. Costa;E. Khatami;G. Batrouni;R. Scalettar
过去几十年来，电子-电子相关性和无序之间的相互作用一直是凝聚态物理学的中心主题，特别关注相互作用可能导致安德森绝缘体离域到金属态的可能性，以及随机性对磁序和莫特相的破坏性影响。在这里，我们扩展了这一物理原理来探索电子-声子相互作用，并通过精确的量子蒙特卡罗模拟表明，通过无序抑制半填充荷斯坦模型中的电荷密度波相关性可以稳定超导相。我们讨论了我们的工作与通过 Se 掺杂研究 ZrTe$_3$ 中电荷有序相的无序淬灭的关系，以及与该材料中观察到的超导性的相互作用，再现了温度无序强度平面中相图的定性特征。
The interplay between electron-electron correlations and disorder has been a central theme of condensed matter physics over the last several decades, with particular interest in the possibility that interactions might cause delocalization of an Anderson insulator into a metallic state, and the disrupting effects of randomness on magnetic order and the Mott phase. Here we extend this physics to explore electron-phonon interactions and show, via exact quantum Monte Carlo simulations, that the suppression of the charge density wave correlations in the half-filled Holstein model by disorder can stabilize a superconducting phase. We discuss the relationship of our work to studies of the disorder quenching of the charge ordered phase in ZrTe$_3$ through Se doping, and the interplay with the observed superconductivity in that material, reproducing the qualitative features of the phase diagram in the temperature-disorder strength plane.