Exciton-polaritons in van der Waals heterostructures embedded in tunable microcavities.
Exciton-polaritons in van der Waals heterostructures embedded in tunable microcavities.
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DOI：
10.1038/ncomms9579
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发表时间：
2015-10-08
影响因子：
16.6
通讯作者：
Tartakovskii AI
中科院分区：
文献类型：
--
作者：
Dufferwiel S;Schwarz S;Withers F;Trichet AA;Li F;Sich M;Del Pozo-Zamudio O;Clark C;Nalitov A;Solnyshkov DD;Malpuech G;Novoselov KS;Smith JM;Skolnick MS;Krizhanovskii DN;Tartakovskii AI
层状材料可以垂直组装，以制造一种新的范德华异质结构，其厚度只有几个原子层，与各种衬底和光电子器件的几何形状兼容，从而实现光物质耦合控制的新策略。在此，我们将二硒化钼/六方氮化硼（MoSe2/hBN）量子阱掺入可调谐光学微腔中。在MoSe2/hBN/MoSe2双量子阱中，由于MoSe2激子和腔光子之间的强耦合，观察到部分光-部分物质极化子本征态，证明了中性激子和腔模式之间明显的反交叉，单个MoSe2单层分裂为20 meV，在MoSe2/hBN/MoSe2双量子阱中增强到29 meV。共振时的分裂估计激子的辐射寿命为0.4 ps。我们的研究结果为基于多量子阱范德华异质结构的室温极化电子器件铺平了道路，其中通过石墨烯触点的结合可以实现极化子凝聚和电极化子注入。极化子是当光和物质之间的相互作用足够强时产生的激子-光子混合粒子。在这里，作者通过使用可调谐光学腔增强光-物质耦合，在二硒化钼/氮化硼量子阱中产生极化子。
Layered materials can be assembled vertically to fabricate a new class of van der Waals heterostructures a few atomic layers thick, compatible with a wide range of substrates and optoelectronic device geometries, enabling new strategies for control of light–matter coupling. Here, we incorporate molybdenum diselenide/hexagonal boron nitride (MoSe2/hBN) quantum wells in a tunable optical microcavity. Part-light–part-matter polariton eigenstates are observed as a result of the strong coupling between MoSe2 excitons and cavity photons, evidenced from a clear anticrossing between the neutral exciton and the cavity modes with a splitting of 20 meV for a single MoSe2 monolayer, enhanced to 29 meV in MoSe2/hBN/MoSe2 double-quantum wells. The splitting at resonance provides an estimate of the exciton radiative lifetime of 0.4 ps. Our results pave the way for room-temperature polaritonic devices based on multiple-quantum-well van der Waals heterostructures, where polariton condensation and electrical polariton injection through the incorporation of graphene contacts may be realized. Polaritons are exciton–photon hybrid particles that are created when the interaction between light and matter is strong enough. Here, the authors create polaritons in molybdenum diselenide/boron nitride quantum wells by enhancing the light–matter coupling using a tunable optical cavity.