Troue Mirco, Figueiredo Johannes, Sigl Lukas, Paspalides Christos, Katzer Manuel, Taniguchi Takashi, Watanabe Kenji, Selig Malte, Knorr Andreas, Wurstbauer Ursula, Holleitner Alexander W
Walter Schottky Institute and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany.
Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany.
Phys Rev Lett. 2023 Jul 21;131(3):036902. doi: 10.1103/PhysRevLett.131.036902.
We report on the spatial coherence of interlayer exciton ensembles as formed in MoSe_{2}/WSe_{2} heterostructures and characterized by point-inversion Michelson-Morley interferometry. Below 10 K, the measured spatial coherence length of the interlayer excitons reaches values equivalent to the lateral expansion of the exciton ensembles. In this regime, the light emission of the excitons turns out to be homogeneously broadened in energy with a high temporal coherence. At higher temperatures, both the spatial coherence length and the temporal coherence time decrease, most likely because of thermal processes. The presented findings point towards a spatially extended, coherent many-body state of interlayer excitons at low temperature.
我们报道了在MoSe₂/WSe₂异质结构中形成的层间激子系综的空间相干性，并通过点反转迈克尔逊-莫雷干涉测量法对其进行了表征。在10K以下，测量得到的层间激子的空间相干长度达到了与激子系综横向扩展相当的值。在这种情况下，激子的发光在能量上呈现均匀展宽，且具有高时间相干性。在较高温度下，空间相干长度和时间相干时间均减小，这很可能是热过程所致。所呈现的研究结果表明，低温下存在空间扩展的、相干的层间激子多体状态。
