[16p-D704-1~18] 10.4 半導体・トポロジカル・超伝導・強相関スピントロニクス

▼ [16p-D704-18] Demonstration of Ferroic Behavior of Berry Curvature Dipole in a Topological Crystalline Insulator at 300 K

〇(D)Taiki Nishijima¹、Takuto Watanabe²、Hiroaki Sekiguchi²、Yuichiro Ando¹、Ei Shigematsu¹、Ryo Ohshima¹、Shinji Kuroda²、Masashi Shiraishi¹ (1.CSRN, Kyoto Univ.、2.Univ. Tsukuba)

キーワード：topological crystalline insulator, Berry curvature, non-volatile

The physics related to Berry curvature is now a central research topic in condensed matter physics. The Berry curvature dipole (BCD) is a significant and intriguing physical parameter that characterizes the antisymmetric distribution of Berry curvature. The BCD exists under inversion symmetry breaking, which induces current-driven out-of-plane magnetization and nonlinear Hall effect (NLHE). However, the creation and controllability of BCDs have been limited to far below room temperature (RT) and nonvolatile (i.e., ferroic) BCDs have not yet been discovered, hindering further progress in topological physics. In this work, we focused on a topological crystalline insulator, Pb_1-xSn_xTe (PST) to realize the ferroic BCD and demonstrated the ferroic BCD by measuring NLHE induced by BCD in PST.