Simulating and exploring Weyl semimetal physics with cold atoms in a two-dimensional optical lattice

Simulating and exploring Weyl semimetal physics with cold atoms in a two-dimensional optical lattice
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在二维光学晶格中模拟和探索冷原子的外尔半金属物理

DOI:
10.1103/physreva.92.013632
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发表时间:
2015-04
期刊:
影响因子:
2.9
通讯作者:
Wang Z. D.
Wang Z. D.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang Dan-Wei;Zhu Shi-Liang;Wang Z. D.

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中国科学技术大学量子信息与量子物理协同创新中心,合肥230026(日期:2015年4月30日)我们提出了一个方案来模拟和探索Weyl半金属物理与超冷费米子原子在一个二维正方形光学晶格受到实验上可实现的自旋轨道耦合和一个阿尔蒂正式维度从外部参数空间,这与三维光学晶格的情况相比可以增加实验可行性。结果表明,这个紧束缚模型系统能够描述具有可调Weyl点的三维Weyl半金属.利用Chern数和无隙边态讨论了相应的拓扑性质。此外,我们还说明了通过测量Bloch-Zener振荡中的原子转移分数,可以在实验上检测到模拟的Weyl点,而特征拓扑不变量可以用粒子泵浦方法测量。
Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China, Hefei 230026, China(Dated: April 30, 2015)We propose a scheme to simulate and explore Weyl semimetal physics with ultracold fermionicatoms in a two-dimensional square optical lattice subjected to experimentally realizable spin-orbitcoupling and an artificial dimension from an external parameter space, which may increase experi-mental feasibility compared with the cases in three-dimensional optical lattices. It is shown that thissystem with a tight-binding model is able to describe essentially three-dimensional Weyl semimetalswith tunable Weyl points. The relevant topological properties are also addressed by means of theChern number and the gapless edge states. Furthermore, we illustrate that the mimicked Weylpoints can be experimentally detected by measuring the atomic transfer fractions in a Bloch-Zeneroscillation, and the characteristic topological invariant can be measured with the particle pumpingapproach.
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