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首页> 外文期刊>Physical review >Spin-valley optical selection rule and strong circular dichroism in silicene
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Spin-valley optical selection rule and strong circular dichroism in silicene

机译：硅中自旋谷光学选择规则和强圆二色性

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摘要

Silicene (a monolayer of silicon atoms) is a topological insulator which undergoes a topological phase transition to a band insulator under an external electric field. We propose a way of detecting the topological phase transition by way of optical absorption. We demonstrate that silicene exhibits a strong circular dichroism with respect to optical absorption and obeys a certain spin-valley selection rule. The selection rule is drastically different between the topological and trivial sectors because a band inversion takes place at the phase transition point. Hence the circular dichroism can be used as a signal to distinguish the topological and trivial sectors. Furthermore, the selection rule enables us to excite electrons with definite spin and valley indices by optical absorption. Photoinduced current is spin polarized, where the spin direction is different between the topological and band insulators. It is useful for future spintronics applications.
机译：硅石（硅原子的单层）是一种拓扑绝缘体，在外部电场作用下会发生拓扑相变，转变为能带绝缘体。我们提出了一种通过光吸收检测拓扑相变的方法。我们证明了硅树脂在光吸收方面表现出很强的圆二色性，并遵守一定的自旋谷选择规则。选择规则在拓扑扇区和琐碎扇区之间完全不同，因为在相变点发生了频带反转。因此，圆二色性可以用作区分拓扑和琐碎扇区的信号。此外，选择规则使我们能够通过光吸收来激发具有确定的自旋和谷值指数的电子。光感应电流自旋极化，拓扑绝缘体和带状绝缘体之间的自旋方向不同。对于将来的自旋电子学应用很有用。

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