论文标题
使用圆形二色性检测手性配对和拓扑超流体
Detecting chiral pairing and topological superfluidity using circular dichroism
论文作者
论文摘要
实现和探索拓扑超流体是基本科学的关键目标，具有令人兴奋的技术承诺。在这里，我们表明，可以通过圆形二色性检测手性$ p_x+ip_y $配对，即可以通过圆形二分性能检测到，即是由顺时针和逆时针循环驱动器引起的激发率的差异。对于弱配对而言，这种差异是由超级流体的Chern数确定的非常好的近似值，而对于超氟差距平方的缩放，非洲的贡献缩放缩放为更强的配对。这引起了实验驱动的目标之间的竞争，以最大程度地提高超流体的临界温度，并观察基础拓扑给出的信号。使用强耦合Eliashberg和Berezinskii-Kosterlitz-无尽的理论，我们分析了这种张力的原子Bose-Fermi气体，这代表了实现手ral超级流体的有前途的平台。我们确定了广泛的系统参数，其中临界温度都高，并且对二分色信号的拓扑贡献是主要的。
Realising and probing topological superfluids is a key goal for fundamental science, with exciting technological promises. Here, we show that chiral $p_x+ip_y$ pairing in a two-dimensional topological superfluid can be detected through circular dichroism, namely, as a difference in the excitation rates induced by a clockwise and counter-clockwise circular drive. For weak pairing, this difference is to a very good approximation determined by the Chern number of the superfluid, whereas there is a non-topological contribution scaling as the superfluid gap squared that becomes signifiant for stronger pairing. This gives rise to a competition between the experimentally driven goal to maximise the critical temperature of the superfluid, and observing a signal given by the underlying topology. Using a combination of strong coupling Eliashberg and Berezinskii-Kosterlitz-Thouless theory, we analyse this tension for an atomic Bose-Fermi gas, which represents a promising platform for realising a chiral superfluid. We identify a wide range of system parameters where both the critical temperature is high and the topological contribution to the dichroic signal is dominant.
