Anti-screening and nonequilibrium layer electric phases in graphene multilayers
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913667279224832 |
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| author | Xiong, Ying Rudner, Mark S. Song, Justin C. W. |
| author_facet | Xiong, Ying Rudner, Mark S. Song, Justin C. W. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_14918 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Anti-screening and nonequilibrium layer electric phases in graphene multilayers Xiong, Ying Rudner, Mark S. Song, Justin C. W. Mesoscale and Nanoscale Physics 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. |
| title | Anti-screening and nonequilibrium layer electric phases in graphene multilayers |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2402.14918 |