Heterostructures of two-dimensional materials offer a versatile platform to study light-matter interactions of electron and hole gases. By separating electron and hole layers with an insulator long-lived electron-hole bound states known as interlayer excitons can form. We predict that by placing an interlayer exciton in a time-reversal-symmetry-breaking chiral cavity the energy spectrum of an interlayer exciton can be reordered. As a consequence of this reordering the ground state of the interlayer exciton can be driven from an s-orbital to a p-orbital, effectively changing the symmetry of the electron-hole pair. We present a phase diagram showing the couplings and separations required for a p-orbital excitonic ground state where we predict that larger interlayer separations require higher cavity couplings. We expect these results to be relevant for angular-momentum-tunable, single photon emission physics.
Interlayer exciton condensates between second Landau level orbitals in double bilayer graphene
Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）；University of California, Berkeley（加州大学伯克利分校）；Harvard University（哈佛大学）；National Institute for Material Science（国立材料研究所）
Evidence for Three-component Interlayer Coherent Exciton Condensation
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Department of Physics, University of Science and Technology of China（中国科学技术大学物理系）；Institute of Microelectronics, Chinese Academy of Science（中国科学院微电子研究所）；Research Center for Functional Materials, National Institute for Materials Science（国立材料研究所功能材料研究中心）；International Center for Materials Nanoarchitectonics, National Institute for Materials Science（国立材料研究所国际纳米结构材料中心）；New Cornerstone Science Laboratory, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所新基石科学实验室）
Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
人们认为分层玻色子偶极流体含有层间分子束缚态的凝聚物。然而，它的实验观察仍然难以捉摸。受最近两项实验工作的启发[Hubert等人，Phys. Rev. X 9，021026（2019）和D. J. Choksy等人，物理评论B 103 045126（2021）]，我们理论上研究，使用数值精确的量子蒙特卡罗计算，集体层间配对的实验签名在垂直堆叠的间接激子（IX）层。我们发现，IX能量转移与每一层的发展非平凡的密度不平衡的函数以下的非单调的趋势与跳跃不连续的密度平衡，确定与层间IX分子间隙。这种行为区分层间束缚对的超流性和不同层中独立的偶极凝聚。考虑到有限的温度和有限的密度不平衡的条件下，我们发现一个级联的Berezinskiii-Kosterlitz-无（BKT）的过渡，最初到一对超流，然后才在较低的温度下，到两个层的完全超流。我们的结果可以提供一个理论解释现有的实验观察在GaAs双量子阱（DQW）双层结构。此外，在未来的研究中，为了优化配对动力学的可见性，我们提出了一个分析，建议现实的实验设置在GaAs和过渡金属二硫属化物（TMD）双层DQW异质结构，集体层间配对和对超流性可以清楚地观察到。
