这里我们介绍一个新的晶格——kagome lattice。主要分析周期边界和开放边界下的情况。 格点的形式 本节内容主要讲kagome晶格的拓扑性质和边缘态。根据该晶格特点可以给出实空间哈密顿量。如下图 实空间上的形式 由于直积的顺序不同(与2DSSH模型类似可以考虑二维空间的直积先后顺序X⊗Y或者Y⊗X)有X⊗Y或者Y...
一:简介 笼目,又称kagome Lattice,是下面这样由六边形和三角形交替组成的结构。 这样的结构经常可以在我国传统的背篓上看见。 目前已经有人在一篇《Beyond the basket case》的论文中研究了如何用计算机复现这种结构。这篇文章可以在Research上免费下载。我已经把它打包到工程文件夹里了。原理如下 先给物体划出三角形...
网络释义 1. 可果美晶格 ...w-core)光子晶体光纤(HC PCF),纤芯为可果美晶格(Kagome lattice),即由交错的三角形所组成的几何结构。 fiber.ofweek.com|基于4个网页
(1)晶格对称破缺导致拓扑量子材料出现新的量子态,并非新鲜课题。已有同行在模型化的breathing kagome lattice中预言了高阶拓扑量子态(如edge、corner states)的存在。不过,看起来似乎还没找到具有此类高阶拓扑态的能稳定存在的材料。这是孙老师他们提出的关键科学问题。
Kagome Lattice: A Molecular Toolkit for Magnetism. Nat. Mater. 2002, 1 (2), 91-92.Atwood J L,Lattice K.A Molecular Toolkit for Magnetism. Nature Materials . 2002Atwood, J. L. Kagome lattice: a molecular toolkit for magnetism. Nat. Mater. 1, 91-92 (2002)....
Band structures for the kagome-lattice model with different NNN interaction t2: (a) t2= 0.064, (b) t2= 0.59. R. Liu et al, JPCM 24, 305602 (2012), https://iopscience.iop.org/article/10.1088/0953-8984/24/30/305602 既然电子运动的能力,即动能、动量...
We investigate the existence and stability of gap vortices and multi-pole gap solitons in a Kagome lattice with a defocusing nonlinearity both in a discrete case and in a continuum one with periodic external modulation. In particular, predictions are made based on expansion around a simple and ...
The kagome lattice is formed by corner-sharing triangles, which can host Dirac points, van Hove singularities (vHSs) and flat bands. The high Fermi surface instability around the vHSs and flat bands can give rise to various physical properties that can be entangled, including superconductivity, ...
Such lattice-borne flat bands are often endowed with nontrivial topology if combined with spin-orbit coupling, while their experimental realization in condensed matter system has been elusive so far. Here, we report the direct observation of topological flat bands in the vicinity of the Fermi ...