Valley selective optical control of excitons in 2D semiconductors using a chiral metasurface [invited]
Valley selective optical control of excitons in 2D semiconductors using a chiral metasurface [invited]
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DOI：
10.1364/ome.9.000536
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发表时间：
2019-02-01
影响因子：
2.8
通讯作者：
Menon, V. M.
中科院分区：
文献类型：
--
作者：
Guddala, S.;Bushati, R.;Menon, V. M.
凝聚态物理学的最新进展表明，具有六方对称性的2D材料（如石墨烯，六方氮化硼（h-BN）和过渡金属二硫属化物（TMD））中电子的谷自由度可以有效地利用，从而导致谷电子学的出现，这为有效的数据传输提供了独特的机会。计算和存储。将电子的谷自由度与光耦合的能力可以进一步扩展操纵这种自由度的方式，从而设想出一类新的固态光子接口和器件。除了这种通过光波控制谷的扩展之外，光子与谷偏振电子的耦合可以显著地扩展可用的光学响应的景观，这可能会带来光子器件中控制光的新手段。在这项工作中，我们设计了这样的混合固态光子元表面集成二维TMD和光子全介质元表面。而TMD具有谷值对光偏振耦合的天然特性。光子超颖表面被设计为产生选择性地耦合到固态TMD组件的谷自由度的手征场。我们的实验表明，这种耦合导致受控谷偏振由于二维材料的手性光子超颖表面的耦合。在这个混合系统中，谷激发子的发射产生了比螺旋度的优先发射。(C)根据OSA开放获取出版协议的条款，2019年美国光学学会
Recent advances in condensed matter physics have shown that the valley degree of freedom of electrons in 2D materials with hexagonal symmetry, such as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMDs), can be efficiently exploited, leading to the emergent field of valleytronics, which offers unique opportunities for efficient data transfer. computing and storage. The ability to couple the valley degree of freedom of electrons with light can further expand the ways one manipulates this degree of freedom, thus envisioning a new class of solid-state-photonic interfaces and devices. Besides this expansion of control of valley by light-waves, coupling of photons with valley-polarized electrons can dramatically expand the landscape of available optical responses, which may bring new means of controlling light in photonic devices. In this work we design such hybrid solid-state photonic metasurface integrating 2D TMD and photonic all-dielectric metasurface. While TMD is naturally endowed with the property of valley to optical-polarization coupling. the photonic metasurface is designed to produce chiral field which selectively couples to the valley degree of freedom of solid-state TMD component. We experimentally demonstrate that such coupling leads to controlled valley polarization due to the coupling of 2D materials with the chiral photonic metasurface. The measured emission from valley cxcitons in this hybrid system yields the preferential emission of specific helicity. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement