论文标题
Rashba-Dresselhaus自旋轨道耦合对二聚体链拓扑的控制
Control of dimer chain topology by Rashba-Dresselhaus spin-orbit coupling
论文作者
论文摘要
从理论上讲，在存在Rashba-Dresselhaus自旋轨道耦合（RDSOC）的情况下，我们研究了一个二聚体链。我们表明，RDSOC可以描述为一个合成量规场，不仅控制位点之间的隧道系数的幅度，而且控制着隧道系数的迹象。这不仅允许模拟通常在各个平台中实现的su-schrieffer-heeger链，而且还可以模仿具有铁磁性和抗铁磁耦合的横向场模型的所有能谱。我们基于液晶微腔模拟了这些有效的哈密顿量的现实实施。在这种情况下，可以通过施加的电压打开和关闭RDSOC，该电压控制谱带拓扑，拓扑边缘状态的存在和特征或基态的性质。该设置对于拓扑光子学应用以及从量子模拟的角度来看是有希望的。
We study theoretically a dimer chain in the presence of Rashba-Dresselhaus spin-orbit coupling (RDSOC) with equal strength. We show that the RDSOC can be described as a synthetic gauge field that controls not only the magnitude but also the sign of tunneling coefficients between sites. This allows to emulate not only a Su-Schrieffer-Heeger chain which is commonly implemented in various platforms, but also, all energy spectra of the transverse field Ising model with both ferromagnetic and antiferromagnetic coupling. We simulate a realistic implementation of these effective Hamiltonians based on liquid crystal microcavities. In that case, the RDSOC can be switched on and off by an applied voltage, which controls the band topology, the existence and characteristics of topological edge states, or the nature of the ground state. This setting is promising for topological photonics applications and from a quantum simulation perspective.
