论文标题
观察单层和双层基于二层的铜层中伪库中的反转和手性对称性的观察
Observation of broken inversion and chiral symmetries in the pseudogap phase in single and double layer bismuth-based cuprates
论文作者
论文摘要
我们通过测量和分析它们的圆形和线性光钙响应来推论单层和双层基于二层的铜酸盐超导体中伪PSEUDOGAP状态的对称性，这些响应与手性和反演分别断裂和倒置分别破坏了顺序参数的参数。在分离出倒置对称性已经破裂的表面产生的微不足道贡献之后，我们表明这两个响应都始于伪塔温度$ t^*$以下，并在其下方生长至相当大的幅度，从而揭示了整体晶体中损坏的对称性。通过详细分析信号对入射角的依赖性，光的极化和晶体的方向，我们能够发现低于$ t^*$的点组对称性仅限于$ mm2 $或$ mm2 $或$ mm2 \ unesionsline {1} $组。考虑到域的形成和以前的测量，我们的结果缩小了$ t^*$的相变点的可能对称性。
We deduce the symmetry of the pseudogap state in the single and double layer bismuth-based cuprate superconductors by measuring and analyzing their circular and linear photogalvanic responses, which are related linearly to the chirality and inversion breaking respectively of the order parameter. After separating out the trivial contribution arising from the surface where inversion symmetry is already broken, we show that both responses start below the pseudogap temperature $T^*$ and grow below it to a sizable magnitude, revealing the broken symmetries in the bulk of the crystal. Through a detailed analysis of the dependence of the signals on the angle of incidence, the polarization of the light, and the orientation of the crystal, we are able to discover that the point group symmetry below $T^*$ is limited to $mm2$ or $mm2\underline{1}$ groups. Taking into account formation of domains and previous measurements, our results narrow down the possible symmetries of the microscopic origin of the phase transition(s) at $T^*$.
