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arXiv 1402.1204cond-mat.str-elcond-mat.mes-hallcond-mat.quant-gasquant-ph
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光晶格中三维手征拓扑绝缘体的研究

Probe of Three-Dimensional Chiral Topological Insulators in an Optical Lattice

Sheng-Tao Wang, Dong-Ling Deng, Lu-Ming Duan

摘要:

我们提出了一个可行的实验方案,在光晶格中实现了一个含有冷费米子原子的三维手性拓扑绝缘体,它具有不同于传统$Z_2$拓扑绝缘体的整数拓扑不变量,并具有显著的宏观零能平带.为了探测它的性质,我们证明了它的特征表面态-狄拉克锥-可以通过飞行时间成像或布拉格光谱探测,平带可以通过测量弱全局陷阱中的原子密度分布来探测。在光晶格中实现这种具有平坦能带的新型拓扑相,将为研究相互作用与拓扑之间的相互作用提供一个独特的实验平台,并为拓扑态的应用开辟新的途径。

英文摘要:

We propose a feasible experimental scheme to realize a three-dimensional chiral topological insulator with cold fermionic atoms in an optical lattice, which is characterized by an integer topological invariant distinct from the conventional $Z_2$ topological insulators and has a remarkable macroscopic zero-energy flat band. To probe its property, we show that its characteristic surface states---the Dirac cones---can be probed through time-of-flight imaging or Bragg spectroscopy and the flat band can be detected via measurement of the atomic density profile in a weak global trap. The realization of this novel topological phase with a flat band in an optical lattice will provide a unique experimental platform to study the interplay between interaction and topology and open new avenues for application of topological states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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