论文标题
野外调制的自旋 - 瓦利 - 轨道假物理学的理论
Theory of field-modulated spin-valley-orbital pseudospin physics
论文作者
论文摘要
过渡金属二分法中的开拓性研究表明，多个角动量自由度的共存 - 自旋（1/2 $ s_z = \ pm 1/2 $），valley（$τ= k，k'$或$ \ $ \ pm 1 $），以及在$ l_z = $ pm 2 $ 2 $ s的互动中 - 降低伪源性的指示是旋转型应用的理想选择。借助现场调制，在物理研究和应用中是一种强大的通用手段，这项工作从复杂的带结构的裸模型开始发展，这是一种野外调制的旋转旋转 - valley-orbital-orbital-orbital pseudospin Physics的一般有效理论，能够描述内部和山谷间动力学。基于该理论，它预测并讨论了伪源对任意取向外部领域的线性响应。为伪造控制确定了范式场配置，包括伪旋转。对于一个非平凡的例子，它提出了一个自旋 - 瓦利 - 轨道量子计算提案，该建议将理论应用于$ s_z $，$τ$和$ l_z $的Qubit Manipulation的全电动，同时控制。它证明了这种控制的生存能力，具有静态场效应和额外的动态电场。给出了优化的量子操作时间〜O（NS）。
Pioneering studies in transition metal dichalcogenides have demonstrated convincingly the co-existence of multiple angular momentum degrees of freedom -- of spin (1/2 $s_z = \pm 1/2$), valley ($τ= K, K'$ or $\pm 1$), and atomic orbital ($l_z = \pm 2$) origins -- in the valence band with strong interlocking among them, which results in noise-resilient pseudospin states ideal for spintronic type applications. With field modulation a powerful, universal means in physics studies and applications, this work develops, from bare models in the context of complicated band structure, a general effective theory of field-modulated spin-valley-orbital pseudospin physics that is able to describe both intra- and inter- valley dynamics. Based on the theory, it predicts and discusses the linear response of a pseudospin to external fields of arbitrary orientations. Paradigm field configurations are identified for pseudospin control including pseudospin flipping. For a nontrivial example, it presents a spin-valley-orbital quantum computing proposal, where the theory is applied to address all-electrical, simultaneous control of $s_z$, $τ$, and $l_z$ for qubit manipulation. It demonstrates the viability of such control with static field effects and an additional dynamic electric field. An optimized qubit manipulation time ~ O(ns) is given.
