石墨烯家族中的卡西米尔力相变。

Casimir force phase transitions in the graphene family.

机构信息

Department of Physics, University of South Florida, Tampa Florida, 33620, USA.

Center for Nonlinear Studies, MS B258, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

出版信息

Nat Commun. 2017 Mar 15;8:14699. doi: 10.1038/ncomms14699.

DOI:10.1038/ncomms14699

PMID:28294111

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5355950/

Abstract

The Casimir force is a universal interaction induced by electromagnetic quantum fluctuations between any types of objects. The expansion of the graphene family by adding silicene, germanene and stanene (2D allotropes of Si, Ge, and Sn), lends itself as a platform to probe Dirac-like physics in honeycomb staggered systems in such a ubiquitous interaction. We discover Casimir force phase transitions between these staggered 2D materials induced by the complex interplay between Dirac physics, spin-orbit coupling and externally applied fields. In particular, we find that the interaction energy experiences different power law distance decays, magnitudes and dependences on characteristic physical constants. Furthermore, due to the topological properties of these materials, repulsive and quantized Casimir interactions become possible.

摘要

卡西米尔力是由任何类型的物体之间的电磁量子涨落引起的一种普遍相互作用。通过添加硅烯、锗烯和锡烯（Si、Ge 和 Sn 的二维同素异形体）来扩展石墨烯家族，为在这种普遍存在的相互作用中探测蜂窝状交错系统中的类狄拉克物理提供了一个平台。我们发现，通过狄拉克物理、自旋轨道耦合和外部施加的场之间的复杂相互作用，这些交错的二维材料之间存在卡西米尔力相变。特别是，我们发现相互作用能量经历了不同的幂律距离衰减、大小以及对特征物理常数的依赖关系。此外，由于这些材料的拓扑性质，排斥和量子化的卡西米尔相互作用成为可能。