Ferroic Berry Curvature Dipole in a Topological Crystalline Insulator at Room Temperature

• DOI: 10.1021/acs.nanolett.2c04900
• Publication Date: 2023-03-02T02:00:53Z
• Authors: Taiki Nishijima; Takuto Watanabe; Hiroaki Sekiguchi; Yuichiro Ando; Ei Shigematsu; Ryo Ohshima; Shinji Kuroda; Masashi Shiraishi
• Keywords: Topological insulator; Point reflection

The physics related to Berry curvature is now a central research topic in condensed matter physics. dipole (BCD) significant and intriguing phenomenon that involves inversion symmetry breaking. However, the creation controllability of BCDs have so far been limited below room temperature (RT), nonvolatile (i.e., ferroic) not yet discovered, hindering further progress topological In this work, we demonstrate switchable BCD effect at RT crystalline insulator, Pb1–xSnxTe (PST), which attributed ferroic distortion. Surprisingly, magnitude several orders greater than nonferroic appear, for example, transition metal dichalcogenides. discovery extraordinarily large PST could pave way materials science engineering novel devices.