手征电荷有序TiSe $_2$中的光学回旋和非局域霍尔效应
Optical Gyrotropy and the Nonlocal Hall Effect in Chiral Charge Ordered TiSe$_2$
摘要：
有人认为，打破空间反演对称性而不是时间反演对称性的材料将是光学旋向性的，并显示出非局域霍尔效应。相关的光学旋转功率和建议的可能性，诱导克尔效应在这种材料中，反过来是最近的讨论的核心关于各种铜氧化物高温超导体的赝能隙相的性质。在这封信中，我们表明，光学回旋和非局域霍尔效应提供了一个灵敏的探针破缺反转对称性$1T$ -TiSe $_2$。最近发现这种材料在低温下具有手性电荷有序相，其中反转对称性自发破缺，而时间反演对称性在其整个相图中保持不破缺。我们估计所产生的旋光常数和光学旋转功率的大小，并建议$1T$ -TiSe $_2$可以作为一个模型材料在解释最近的克尔效应测量铜氧化物超导体。
英文摘要：
It has been suggested that materials which break spatial inversion symmetry, but not time reversal symmetry, will be optically gyrotropic and display a nonlocal Hall effect. The associated optical rotary power and the suggested possibility of inducing a Kerr effect in such materials, in turn are central to recent discussions about the nature of the pseudogap phases of various cuprate high-temperature superconductors. In this letter, we show that optical gyrotropy and the nonlocal Hall effect provide a sensitive probe of broken inversion symmetry in $1T$-TiSe$_2$. This material was recently found to possess a chiral charge ordered phase at low temperatures, in which inversion symmetry is spontaneously broken, while time reversal symmetry remains unbroken throughout its phase diagram. We estimate the magnitude of the resulting gyrotropic constant and optical rotary power and suggest that $1T$-TiSe$_2$ may be employed as a model material in the interpretation of recent Kerr effect measurements in cuprate superconductors.
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