激子凝聚的量子特征
Quantum signature of exciton condensation
摘要：
激子凝聚是近年来在石墨烯双电层中发现的一种激子的玻色-爱因斯坦凝聚。我们表明，一个通用的量子签名激子凝聚可以用来标识和量化激子凝聚在分子系统中的两个电子约化密度矩阵的直接计算。并五苯和并六苯EDLs的粒子-空穴约化密度矩阵中计算的大本征值揭示了凝聚的开始，表明在较小尺度的分子EDLs中激子凝聚的潜力。
英文摘要：
Exciton condensation, a Bose-Einstein-like condensation of excitons, was recently reported in an electronic double layer (EDL) of graphene. We show that a universal quantum signature for exciton condensation can be used to both identity and quantify exciton condensation in molecular systems from direct calculations of the two-electron reduced density matrix. Computed large eigenvalues in the particle-hole reduced-density matrices of pentacene and hexacene EDLs reveal the beginnings of condensation, suggesting the potential for exciton condensation in smaller scale molecular EDLs.
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