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arXiv 1503.00092cond-mat.mes-hallcond-mat.mtrl-sci
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重原子修饰石墨烯中电子-声子耦合

Electron-spin to Phonon Coupling in Graphene Decorated with Heavy Adatoms

Jhih-Shih You, Daw-Wei Wang, Miguel A. Cazalilla

摘要:

石墨烯中天然弱的自旋-轨道耦合可以通过吸附原子沉积而大大增强(例如Weeks等人,Phys.Rev.X1,021001(2011))。然而,吸附原子的动力学也诱导声子和电子自旋之间的耦合。利用群论和紧束缚模型,系统地研究了单层石墨烯中低能面内声子与电子自旋之间的耦合.我们的研究结果为进一步研究该体系的自旋输运和超导性奠定了基础。为了量化耦合到晶格上的电子自旋动力学的影响,我们计算了电子和空穴的自旋翻转率。我们发现,后者表现出强烈的依赖于准粒子能量和系统温度。

英文摘要:

The naturally weak spin-orbit coupling in Graphene can be largely enhanced by adatom deposition (e.g. Weeks et al. Phys. Rev. X 1, 021001 (2011)). However, the dynamics of the adatoms also induces a coupling between phonons and the electron spin. Using group theory and a tight-binding model, we systematically investigate the coupling between the low-energy in-plane phonons and the electron spin in single-layer graphene uniformly decorated with heavy adatoms. Our results provide the foundation for future investigations of spin transport and superconductivity in this system. In order to quantify the effect of the coupling to the lattice on the electronic spin dynamics, we compute the spin-flip rate of electrons and holes. We show that the latter exhibits a strong dependence on the quasi-particle energy and system temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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