arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1607.04823cond-mat.mtrl-sci
收藏

无磁场条件下三维拓扑绝缘体巨磁光效应的实现

Realizing Giant Magneto-Optical Effects in 3D Topological Insulators Without Magnetic Fields

Moti Fridman, Vlada Artel, Anna Peled, Shir Shahal, Ashwin Ramasubramaniam, Doron Naveh

摘要:

拓扑绝缘体由于表面电子态的螺旋性质而显示出不寻常的光-物质相互作用。研究了光纤中光与三维拓扑绝缘体Sb 2 Te 3晶体的近场相互作用,观察到了较大的法拉第旋转。光纤中这种意想不到的偏振旋转的起源归因于TI-光纤界面处的磁光克尔效应。我们表明,时间反演对称性破缺,这是由于塞曼耦合的电磁场与TI的表面电子,和反转对称性破缺的光激发,这是由于指数衰减的倏逝光在TI晶体,实现这一巨大的偏振旋转的综合效应。我们的工作展示了一个简单的方法,实现大的磁光效应,没有任何磁场,利用独特的物理轻物质相互作用在TI表面。

英文摘要:

Topological insulators display unusual light-matter interactions due to the helical nature of surface electronic states. We study the near-field interaction of light propagating in an optical fiber with crystals of Sb2Te3, a 3D topological insulator (TI), and observe a large apparent Faraday rotation. The origin of this unexpected polarization rotation in the optical fiber is attributed to a magneto-optical Kerr effect at the TI-fiber interface. We show that the combined effects of time-reversal symmetry breaking, which arises from Zeeman coupling of the electromagnetic field with the surface electrons of the TI, and inversion symmetry breaking of optical excitations, which arises from the exponential decay of the evanescent light across the TI crystal, are central to realizing this giant polarization rotation. Our work demonstrates a facile approach for realizing large magneto-optical effects without any magnetic fields by exploiting the unique physics of light-matter interactions at TI surfaces.

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。

↑