2020/09/08 by M. Tanaka, Yukako Fujishiro, Y. Fujishiro +19 · 97 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Band gap #Berry connection and curvature #Condensed matter physics #Electron #Electron mobility #Geometric phase #Graphene research and applications #Hall effect #Magnetic field #Materials science #Nanotechnology #Physics #Quantum Hall effect #Quantum anomalous Hall effect #Quantum mechanics #Semimetal #Thin film #Topological Materials and Phenomena #Topological insulator #Topology (electrical circuits) #cond-mat.mtrl-sci
paper · pdf · doi:10.1021/acs.nanolett.0c02962
published in Nano Letters 20(10), 7476-7481 (American Chemical Society)
openalex publication_date 2020/09/08 · arxiv created 2020/09/16 · arxiv updated 2020/09/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Magnetic Weyl semimetals attract considerable interest not only for their topological quantum phenomena but also as an emerging materials class for realizing quantum anomalous Hall effect in the two-dimensional limit. A shandite compound Co 3 Sn 2 S 2 with layered kagome-lattices is one such material, where vigorous efforts have been devoted to synthesize the two-dimensional crystal. Here, we report a synthesis of Co 3 Sn 2 S 2 thin flakes with a thickness of 250 nm by chemical vapor transport method. We find that this facile bottom-up approach allows the formation of large-sized Co 3 Sn 2 S 2 thin flakes of high-quality, where we identify the largest electron mobility (∼2600 cm 2 V –1 s –1 ) among magnetic topological semimetals, as well as the large anomalous Hall conductivity (∼1400 Ω –1 cm –1 ) and anomalous Hall angle (∼32%) arising from the Berry curvature. Our study provides a viable platform for studying high-quality thin flakes of magnetic Weyl semimetal and stimulate further research on unexplored topological phenomena in the two-dimensional limit.