Sensitive linear response of an electron-hole superfluid in a periodic potential |
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| Institution: | 1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Panjin 124221, China;2. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;3. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Institute of Chemistry, Department of Chemistry, School of Science, Tianjin University, Tianjin 300354, China;1. Department of Statistics, Faculty of Business and Economics, University of Augsburg, Germany;2. Center for Mathematical Sciences, Technische Universität München, Germany |
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| Abstract: | We consider excitons in a two-dimensional periodic potential and study the linear response of the excitonic superfluid to an electromagnetic wave at low and high densities. It turns out that the static structure factor for small wavevectors is very sensitive to a change of density and temperature. It is a consequence of the fact that thermal fluctuations play a crucial role at small wavevectors, since exchanging the order of the two limits, zero temperature and vanishing wavevector, leads to different results for the structure factor. This effect could be used for high accuracy measurements in the superfluid exciton phase, which might be realized by a gated electron-hole gas, for instance, in coupled quantum wells or double layer materials. The transition of the exciton system from the superfluid state to a non-superfluid state and its manifestation by light scattering are discussed. |
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| Keywords: | Coupled quantum wells Excitons Superfluid Static structure factor |
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