Large magneto-optical effects in the topological chiral antiferromagnet Mn 3 Sn

摘要: There has been a surge of interest in antiferromagnetic (AF) materials due to their favorable properties for device applications, including a vanishingly small stray field and faster (THz) spin dynamics compared to ferromagnets. In fact, motivated by these intriguing properties, several breakthroughs have been made: an anisotropic magnetoresistance (even-function response under time-reversal (TR)) for detecting collinear AF ordering. Another breakthrough is an odd-function response under TR in the chiral antiferromagnet Mn 3 Sn, such as an anomalous Hall and Nernst effects at zero magnetic field. Moreover, recent studies have revealed that Mn 3 Sn is a TR symmetry breaking Weyl metal possessing a large and controllable Berry curvature in momentum space. In this presentation, we will mainly talk about the magneto-optical properties of Mn 3 Sn. We found that despite a negligibly small magnetization, Mn 3 Sn …