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arXiv 2301.02255cond-mat.mes-hall
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范德华异质结中的层光伏效应

Layer photovoltaic effect in van der Waals heterostructures

Oles Matsyshyn, Ying Xiong, Arpit Arora, Justin C. W. Song

AI总结:

本文提出非中心对称范德华异质结中存在可通过光照控制的层光伏效应(LPE),系统分类了其依赖对称性的多种机制,并发现该效应在太赫兹频段具有可观的极化率,可作为体光伏探测的新手段。

摘要:

我们认为,非中心对称层状异质结的层电极化通常可以通过光照来控制,从而产生层光伏效应(LPE)。LPE具有丰富的物理现象,可源于多种不同机制,对对称性(例如点群和时间反演)以及费米面的存在与否表现出强烈的敏感性。我们系统地对其进行了分类,并揭示了LPE如何在多种光偏振甚至非偏振光下显现。这些不寻常的层光响应可以在多种层状异质结中实现,例如排列在六方氮化硼上的双层石墨烯,并在太赫兹频率范围内表现出可观的层极化率,可作为体光伏探测的新颖手段。

英文摘要:

We argue that the layer electric polarization of noncentrosymmetric layered heterostructures can be generically controlled by light yielding a layer photovoltaic effect (LPE). The LPE possesses a rich phenomenology and can arise from myriad distinct mechanisms displaying strong sensitivity to symmetry (e.g., point group and time-reversal) as well as the presence/absence of a Fermi surface. We systematically classify these and unveil how LPE manifests for a range of light polarizations and even for unpolarized light. These unusual layer photoresponses can be realized in a range of layered heterostructures such as bilayer graphene aligned on hexagonal Boron Nitride and manifest sizeable layer polarization susceptibilities in the terahertz frequency range that can be used as novel means of bulk photodetection.

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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