论文标题
腔诱导的fulde-ferrell-larkin-ovchinnikov超速费米气体
Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases
论文作者
论文摘要
由于最近放置在空腔中的超电原子气体的实验进步的动机，我们研究了原子腔耦合对被困在光学晶格中的费米气体的影响。通过绝热消除空腔光子场，原子腔耦合产生了有效的远程相互作用。它导致各种两体散射过程，在此过程中，原子对可以获得额外的质量动量。这揭示了Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）超流体的可能性，其中原子配对动量非零。通过在平均场水平上检查相图，我们确认FFLO超氟相位与零摩肌配对并存，并且是携带最低能量的基态。此外，只要存在腔诱导的相互作用，表征非零摩托姆配对的顺序参数就不会消失。
Motivated by recent experimental advances in ultracold atomic gases placed in cavities, we study the influence of the atom-cavity coupling on the Fermi gases trapped in optical lattices. By adiabatic elimination of the cavity photon field, the atom-cavity coupling gives rise to effective long-range interactions. It results in a variety of two-body scattering processes, during which the atomic pairs can acquire an additional center-of-mass momentum. This reveals the possibility of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids in which the atomic pairing momentum is nonzero. By inspecting the phase diagram at the mean-field level, we confirm that the FFLO superfluid phase coexists with the zero-momentum pairing, and is the ground state that hosts the lowest energy. Furthermore, the order parameter characterizing the nonzero-momentum pairing does not vanish as long as the cavity-induced interaction is present.
