腔内原子对填充光晶格中的亮激子和暗激子
Bright and dark excitons in an atom--pair filled optical lattice within a cavity
摘要：
研究了光晶格中简并双原子气体的电子激发。局域偶极-偶极相互作用产生长寿命反对称和短寿命对称叠加的单个原子激发作为最低的内部在位激发。由于更大的偶极矩，对称态有效地耦合到相邻的晶格位置，并且可以很好地由Frenkel激子表示，而反对称暗态保持局部化。在腔中，只有对称态与腔光子耦合，引起长程相互作用，形成极化激元。我们计算了它们的色散曲线以及腔的透射和反射光谱来观察它们。对于具有非球面位置的晶格，亮态和暗态得到混合，并且它们的相对激发能取决于光子偏振。该系统将允许研究原子填充光晶格中的新型固态现象。
英文摘要：
We study electronic excitations of a degenerate gas of atoms trapped in pairs in an optical lattice. Local dipole-dipole interactions produce a long lived antisymmetric and a short lived symmetric superposition of individual atomic excitations as the lowest internal on-site excitations. Due to the much larger dipole moment the symmetric states couple efficiently to neighbouring lattice sites and can be well represented by Frenkel excitons, while the antisymmetric dark states stay localized. Within a cavity only symmetric states couple to cavity photons inducing long range interactions to form polaritons. We calculate their dispersion curves as well as cavity transmission and reflection spectra to observe them. For a lattice with aspherical sites bright and dark states get mixed and their relative excitation energies depend on photon polarizations. The system should allow to study new types of solid state phenomena in atom filled optical lattices.
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