Frustrated phase separation in two-dimensional charged systems
Frustrated phase separation in two-dimensional charged systems
复制标题
二维带电系统中的受阻相分离
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
C. Castro
中科院分区：
文献类型：
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作者：
C. Ortix;J. Lorenzana;C. Castro
我们研究了二维电子系统中由长程库仑相互作用导致的相分离受阻FPS，重点讨论了金属相和绝缘相的情况。在混合相中，系统根据一相由另一相承载的介观不均匀性自组织。我们分析了圆形水滴和交错条纹的情况。作为第一近似，我们将每个非均匀内部的密度视为常数，并且在某些情况下，我们通过更复杂的局部密度近似来检验这一假设的准确性。我们发现，从均匀相到受阻相分离相的转变顺序取决于其几何排列。与在三维系统中发现的相反，不均匀的大小没有上限。这种不同之处在于长程库仑相互作用和屏蔽在二维和三维系统中的不同作用。我们的结论是，二维系统更容易产生介观FPS。
We study phase-separation frustrated FPS by the long-range Coulomb interaction in two-dimensional electronic systems with emphasis to the case of a metallic and an insulating phase. In the mixed phase, the system self-organizes in terms of mesoscopic inhomogeneities of one phase hosted by the other phase. We analyze the cases of circular drops and alternating stripes. As a first approximation, we consider the density inside each inhomogeneity as constant and in some cases, we test the accuracy of this assumption by a more involved local density approximation. We find that the transition from the uniform phase to the frustrated phase-separated phase changes order depending upon its geometric arrangement. Contrary to what was found in three-dimensional systems, there is no upper bound for the size of inhomogeneities. This difference stands on the different role of the long-range Coulomb interaction and screening in two- and three-dimensional systems. We conclude that two-dimensional systems are more prone to mesoscopic FPS.