تقرير
Theory of field-modulated spin-valley-orbital pseudospin physics
العنوان: | Theory of field-modulated spin-valley-orbital pseudospin physics |
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المؤلفون: | Chen, Feng-Wu, Wu, Yu-Shu |
المصدر: | Phys. Rev. Res. 2, 013076 (2020) |
سنة النشر: | 2020 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
الوصف: | 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 ($\tau = K, K'$ 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 $s_z$, $\tau$, 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. |
نوع الوثيقة: | Working Paper |
DOI: | 10.1103/PhysRevResearch.2.013076 |
URL الوصول: | http://arxiv.org/abs/2001.09255 |
رقم الأكسشن: | edsarx.2001.09255 |
قاعدة البيانات: | arXiv |
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