Time-Reversal-Breaking and $d$-Wave Superfluidity of Ultracold Dipolar Fermions in Optical Lattices
Bulletin of the American Physical Society(2013)
摘要
We describe possible superfluid phases of ultracold dipolar fermions in
optical lattices for two-dimensional systems. Considering the many-body
screening of dipolar interactions at larger filling factors, we show that
several superfluid phases with distinct pairing symmetries naturally emerge in
the singlet channel: local $s$-wave $(sl)$, extended $s$-wave $(se)$, $d$-wave
$(d)$ or time-reversal-symmetry breaking $(sl + se \pm id)$-wave. The
temperature versus filling factor phase diagram indicates that $d$-wave is
favored near half-filling, that $(sl + se)$-wave is favored near zero or full
filling, and that time-reversal-breaking $(sl + se \pm id)$-wave is favored in
between. When a harmonic trap is included a sequence of phases can exist in the
cloud depending on the filling factor at the center of the trap. Most notably
in the region where the $(sl + se \pm id)$-wave superfluid exists, spontaneous
currents are generated, and may be detected using velocity sensitive Bragg
spectroscopy.
更多查看译文
关键词
time reversal,phase diagram,time reversal symmetry,optical lattice
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要