Spin-based effects and transport properties of a spin-orbit-coupled hexagonal optical lattice
文献类型：期刊论文
| 作者 | Zhu, GB ; Sun, Q ; Zhang, YY ; Chan, KS ; Liu, WM ; Ji, AC |
| 刊名 | PHYSICAL REVIEW A
 |
| 出版日期 | 2013 |
| 卷号 | 88期号:2 |
| ISSN号 | 1050-2947 |
| 通讯作者 | Ji, AC (reprint author), Capital Normal Univ, Dept Phys, Beijing 100048, Peoples R China. |
| 中文摘要 | We investigate an ultracold Fermi gas in a hexagonal lattice subjected to a strong Rashba spin-orbit coupling (SOC). We focus on the marginal Abelian limit with the strength of SOC kappa = pi/2, where the derived Dirac fermions are spin-1/2 spinors in contrast to the pure hexagonal lattice. We find a double-degeneracy at the center of the Brillouin zone, which is a spin-3/2 Dirac-Weyl fermion that can be represented as two spin-1/2 fermions. While at the corner of the Brillouin zone, there occur another two spin-1/2 fermions. These Dirac spinors display a verity of spin textures beyond the usual topological properties. Furthermore, we investigate the energy spectrum of one- dimensional (1D) zigzag and armchair ribbons, and show that the appearance of a new cone at the center of the Brillouin zone can induce two flat bands in a 1D zigzag ribbon. These unique properties allow us to transport a single spin-1/2 Dirac spinor through the 1D zigzag ribbon with two quasi-two-dimensional leads, where only the spin-up or spin-down freedom of the Dirac spinors can transit through the ribbon. |
| 资助信息 | NCET; NSFC [11074175, 10904096, 11204294, 11274260]; NKBRSFC [2011CB921502]; General Research Fund of the Hong Kong Research Grants Council [CityU 100311/11P]; City University of Hong Kong Research Project [9610180] |
| 语种 | 英语 |
| 公开日期 | 2014-01-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57460]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhu, GB,Sun, Q,Zhang, YY,et al. Spin-based effects and transport properties of a spin-orbit-coupled hexagonal optical lattice[J]. PHYSICAL REVIEW A,2013,88(2). |
| APA | Zhu, GB,Sun, Q,Zhang, YY,Chan, KS,Liu, WM,&Ji, AC.(2013).Spin-based effects and transport properties of a spin-orbit-coupled hexagonal optical lattice.PHYSICAL REVIEW A,88(2). |
| MLA | Zhu, GB,et al."Spin-based effects and transport properties of a spin-orbit-coupled hexagonal optical lattice".PHYSICAL REVIEW A 88.2(2013). |
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来源：物理研究所
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