Glassy Dynamics in Geometrically Frustrated Coulomb Liquids without Disorder
Glassy Dynamics in Geometrically Frustrated Coulomb Liquids without Disorder
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DOI：
10.1103/physrevlett.115.025701
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发表时间：
2015-07-08
影响因子：
8.6
通讯作者：
Dobrosavljevic, Vladimir
中科院分区：
文献类型：
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作者：
Mahmoudian, Samiyeh;Rademaker, Louk;Dobrosavljevic, Vladimir
我们证明，在经典极限下，引入长程库仑相互作用可以立即解除由电子在四分之一填充的三角形晶格上的几何挫折引起的大量基态简并。重要的结果包括条纹有序晶体（全局）基态的稳定，但也出现了许多具有无定形“条纹玻璃”空间结构的低洼亚稳态。因此，在中等温度下，条纹序的熔化导致了受挫的库仑液体，表现出非常缓慢的（粘性）动力学，在冷却时以阿累尼乌斯方式增长的弛豫时间非常长，就像典型的强玻璃形成物一样。在较短的时间尺度上，体系失去平衡，并表现出玻璃化转变以上过冷液体的老化现象。我们的结果与最近观察到的δ -(BEDT-TTF)(2)族超净三角形有机材料的电荷玻璃行为有显著的相似性。
We show that introducing long-range Coulomb interactions immediately lifts the massive ground state degeneracy induced by geometric frustration for electrons on quarter-filled triangular lattices in the classical limit. Important consequences include the stabilization of a stripe-ordered crystalline (global) ground state, but also the emergence of very many low-lying metastable states with amorphous "stripe-glass" spatial structures. Melting of the stripe order thus leads to a frustrated Coulomb liquid at intermediate temperatures, showing remarkably slow (viscous) dynamics, with very long relaxation times growing in Arrhenius fashion upon cooling, as typical of strong glass formers. On shorter time scales, the system falls out of equilibrium and displays the aging phenomena characteristic of supercooled liquids above the glass transition. Our results show remarkable similarity with the recent observations of charge-glass behavior in ultraclean triangular organic materials of the theta-(BEDT-TTF)(2) family.