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arXiv 2402.14918cond-mat.mes-hall
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石墨烯多层膜中的反屏蔽与非平衡层电相位

Anti-screening and nonequilibrium layer electric phases in graphene multilayers

Ying Xiong, Mark S. Rudner, Justin C. W. Song

AI总结:

本文提出利用光激发将多层石墨烯中的传统面外屏蔽转化为反屏蔽,实现近零屏蔽、反屏蔽或过屏蔽等多种非平衡屏蔽态,并在适度光强下诱导出多稳态类铁电极化,为动态量子物质和非平衡对称性破缺相提供了新范式。

摘要:

屏蔽是一种普遍存在的现象,通过束缚或移动电荷的极化来减弱材料内部的电场强度。本文展示了如何利用光激发作为旋钮,将多层石墨烯堆叠中传统的面外屏蔽转化为反屏蔽(即电场的放大)。研究发现,通过改变光激发强度,可以实现多种非平衡屏蔽态,包括近零屏蔽、反屏蔽或过屏蔽(反转电场)。引人注目的是,在适度的连续波光激发强度下,非平衡极化态变得多稳态,即使在名义上具有空间反演对称性的堆叠中且无外加位移场时,也能承载具有非零面外极化(和带隙)的光致类铁电稳态。这一丰富的现象学揭示了一种动态量子物质的新范式,有望实现多种非平衡破缺对称相。

英文摘要:

Screening is a ubiquitous phenomenon through which the polarization of bound or mobile charges tends to reduce the strengths of electric fields inside materials. Here we show how photoexcitation can be used as a knob to transform conventional out-of-plane screening into anti-screening - the amplification of electric fields - in multilayer graphene stacks. We find that, by varying the photoexcitation intensity, multiple nonequilibrium screening regimes can be accessed, including near-zero screening, anti-screening, or overscreening (reversing electric fields). Strikingly, at modest continuous wave photoexcitation intensities, the nonequilibrium polarization states become multistable, hosting light-induced ferroelectric-like steady states with nonvanishing out-of-plane polarization (and band gaps) even in the absence of an externally applied displacement field in nominally inversion symmetric stacks. This rich phenomenology reveals a novel paradigm of dynamical quantum matter that we expect will enable a variety of nonequilibrium broken symmetry phases.

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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