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arXiv 2201.04106cond-mat.mes-hall
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磁化Janus Pt二硫族化合物的巨谷极化自旋劈裂

Giant Valley-Polarized Spin Splittings in Magnetized Janus Pt Dichalcogenides

Shahid Sattar, J. Andreas Larsson, C. M. Canali, Stephan Roche, Jose H. Garcia

摘要:

我们揭示了巨大的邻近感生磁性和谷极化效应的Janus Pt dichalcogenides(如SPtSe),当绑定到氧化铕(EuO)衬底。使用第一性原理模拟,令人惊讶地发现,电荷重新分布,由于接近EuO,导致形成两个K和K $^{'}$谷的导带。这些山谷中的每一个都显示出自己的自旋极化和特定的自旋纹理所决定的破碎反转和时间反转对称性,以及谷交换和Rashba分裂高达数百meV。这为探索低维半导体中的新型自旋谷物理提供了一个平台,潜在的自旋输运机制,如自旋轨道扭矩,对无序和温度效应更具弹性。

英文摘要:

We reveal giant proximity-induced magnetism and valley-polarization effects in Janus Pt dichalcogenides (such as SPtSe), when bound to the Europium oxide (EuO) substrate. Using first-principles simulations, it is surprisingly found that the charge redistribution, resulting from proximity with EuO, leads to the formation of two K and K$^{'}$valleys in the conduction bands. Each of these valleys displays its own spin polarization and a specific spin-texture dictated by broken inversion and time-reversal symmetries, and valley-exchange and Rashba splittings as large as hundreds of meV. This provides a platform for exploring novel spin-valley physics in low-dimensional semiconductors, with potential spin transport mechanisms such as spin-orbit torques much more resilient to disorder and temperature effects.

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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