Das Tanmoy
Department of Physics, Indian Institute of Physics, Bangalore-560012, India.
J Phys Condens Matter. 2016 Jul 27;28(29):294001. doi: 10.1088/0953-8984/28/29/294001. Epub 2016 Jun 1.
We study directional dependent band gap evolutions and metal-insulator transitions (MITs) in model quantum wire systems within the spin-orbit density wave (SODW) model. The evolution of MIT is studied as a function of varying anisotropy between the intra-wire hopping ([Formula: see text]) and inter-wire hopping ([Formula: see text]) with Rashba spin-orbit coupling. We find that as long as the anisotropy ratio ([Formula: see text]) remains below 0.5, and the Fermi surface nesting is tuned to [Formula: see text], an exotic SODW induced MIT easily develops, with its critical interaction strength increasing with increasing anisotropy. As [Formula: see text] (2D system), the nesting vector switches to [Formula: see text], making this state again suitable for an isotropic MIT. Finally, we discuss various physical consequences and possible applications of the directional dependent MIT.
我们在自旋轨道密度波（SODW）模型下研究了模型量子线系统中方向依赖的带隙演化和金属-绝缘体转变（MITs）。研究了MIT随具有Rashba自旋轨道耦合的线内跳跃（[公式：见正文]）和线间跳跃（[公式：见正文]）之间变化的各向异性的函数关系。我们发现，只要各向异性比（[公式：见正文]）保持在0.5以下，并且费米面嵌套被调整到[公式：见正文]，一种奇异的由SODW诱导的MIT就很容易出现，其临界相互作用强度随各向异性增加而增大。当[公式：见正文]（二维系统）时，嵌套矢量切换到[公式：见正文]，使得这种状态再次适合各向同性的MIT。最后，我们讨论了方向依赖的MIT的各种物理结果和可能的应用。
