arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.06755cond-mat.str-el
收藏

铋基铜氧化物单层和双层赝能隙相中破缺反转和手征对称性的观察

Observation of broken inversion and chiral symmetries in the pseudogap phase in single and double layer bismuth-based cuprates

Sejoon Lim, Chandra M. Varma, Hiroshi Eisaki, Aharon Kapitulnik

摘要:

通过测量和分析单层和双层铋基铜氧化物超导体的圆形和线性光电流响应,推导出赝能隙态的对称性,它们分别与序参量的手征性和反转破缺线性相关.分离出的微不足道的贡献所产生的表面的反转对称性已经被打破后,我们表明,这两个响应开始低于赝能隙温度$T^*$,并低于它的增长到一个相当大的幅度,揭示了破碎的对称性在大部分的晶体。通过详细分析信号对入射角、光的偏振和晶体取向的依赖性,我们能够发现$T^*$以下的点群对称性仅限于$mm2$或$mm2\underline{1}$群。考虑到形成的领域和以前的测量,我们的结果缩小了可能的对称性的微观起源的相变(S)在$T^*$。

英文摘要:

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 $T^*$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑