Superfluidity and collective properties of excitonic polaritons in gapped graphene in a microcavity
Superfluidity and collective properties of excitonic polaritons in gapped graphene in a microcavity
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DOI：
10.1103/physrevb.86.235404
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发表时间：
2012-12-05
影响因子：
3.7
通讯作者：
Ziegler, Klaus
中科院分区：
文献类型：
--
作者：
Berman, Oleg L.;Kezerashvili, Roman Ya.;Ziegler, Klaus
我们预测了由嵌入其中的带隙石墨烯中的激子和微腔光子形成的光学微腔中极化子的形成和超流性。得到了与存在带隙时在石墨烯中产生激子有关的拉比分裂。结果表明，随着能隙的增大，拉比分裂减小，而微腔的介电常数越大，拉比分裂越小。给出了集体激励和声速的分析。我们证明了超流密度n(S)和Kosterlitz-Thouless相变的温度T-c是能隙的递减函数。
We predict the formation and superfluidity of polaritons in an optical microcavity formed by excitons in gapped graphene embedded there and microcavity photons. The Rabi splitting related to the creation of an exciton in a graphene layer in the presence of the band gap is obtained. It is demonstrated that the Rabi splitting decreases when the energy gap increases, while the larger value of the dielectric constant of the microcavity gives a smaller value for the Rabi splitting. The analysis of collective excitations as well as the sound velocity is presented. We show that the superfluid density n(s) and temperature of the Kosterlitz-Thouless phase transition T-c are decreasing functions of the energy gap.