Topological properties of a dense atomic lattice gas
Topological properties of a dense atomic lattice gas
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DOI：
10.1103/physreva.96.041603
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发表时间：
2017-10-10
影响因子：
2.9
通讯作者：
Olmos, Beatriz
中科院分区：
文献类型：
--
作者：
Bettles, Robert J.;Minar, Jiri;Olmos, Beatriz
研究了稠密二维原子格子气中拓扑相的存在性。原子与辐射场的耦合引起耗散和非平凡的相干长程交换相互作用，其形式超出了简单的幂律。远场项的潜力，这是特别相关的原子分离可比的原子过渡波长，可以引起能量谱与单边发散的布里渊区。这种长程相互作用的性质还有另一个重要的后果：它可以打破拓扑绝缘体中标准的体-边界关系。我们表明，拓扑性质，如运输的激发沿着边缘的晶格是强大的晶格缺陷和耗散的存在。后者是特别相关的耗散和连贯的相互作用是不可避免地连接在我们的设置。
We investigate the existence of topological phases in a dense two-dimensional atomic lattice gas. The coupling of the atoms to the radiation field gives rise to dissipation and a nontrivial coherent long-range exchange interaction whose form goes beyond a simple power law. The far-field terms of the potential-which are particularly relevant for atomic separations comparable to the atomic transition wavelength-can give rise to energy spectra with one-sided divergences in the Brillouin zone. The long-ranged character of the interactions has another important consequence: it can break the standard bulk-boundary relation in topological insulators. We show that topological properties such as the transport of an excitation along the edge of the lattice are robust with respect to the presence of lattice defects and dissipation. The latter is of particular relevance as dissipation and coherent interactions are inevitably connected in our setting.