Universal aspects of coulomb-frustrated phase separation
Universal aspects of coulomb-frustrated phase separation
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DOI：
10.1103/physrevlett.94.056805
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发表时间：
2005-02-11
影响因子：
8.6
通讯作者：
Spivak, B
中科院分区：
文献类型：
--
作者：
Jamei, R;Kivelson, S;Spivak, B
我们研究了库仑相互作用对经历一级相变的系统的影响。在二维(2D)中，在临界密度附近，体系对新的中间相的形成普遍是不稳定的，我们称之为“电子微乳液相”，它由两个相互竞争的相的区域组成的中等尺度的混合物组成。一个推论是，从2D维格纳晶体到均匀的电子液体不可能作为密度的函数而直接跃迁。在3D中，如果库仑相互作用的强度超过一个临界值，则不会发生相分离，而对于库仑强度较弱的情况，电子微乳液是不可避免的。这一趋势在各向异性(准2D或准1D)系统中更为明显，在这些系统中，转变的魔鬼阶梯是可能的。
We study the consequences of Coulomb interactions on a system undergoing a putative first order phase transition. In two dimensions (2D), near the critical density, the system is universally unstable to the formation of new intermediate phases, which we call "electronic microemulsion phases," which consist of an intermediate scale mixture of regions of the two competing phases. A corollary is that there can be no direct transition as a function of density from a 2D Wigner crystal to a uniform electron liquid. In 3D, if the strength of the Coulomb interactions exceeds a critical value, no phase separation occurs, while for the weaker Coulomb strength electronic microemulsions are inevitable. This tendency is considerably more pronounced in anisotropic (quasi-2D or quasi-1D) systems, where a devil's staircase of transitions is possible.