Presentation Information
[9a-E208-1]Electric-field-induced magnetic phase transition at the surface of correlated insulator FeSb2
〇(DC)Takahiro Iwagaki1,2, Hideki Matsuoka1, Ginta Hoshino3, Kanata Watanabe3, Takashi Koretsune3, Naoya Kanazawa1 (1.IIS, Univ. of Tokyo, 2.Dept. of Appl. Phys., Univ. of Tokyo, 3.Dept. of Phys., Tohoku Univ.)
Keywords:
Strongly correlated electron system,Flat-band,Topological surface states
Quantum phase control in strongly correlated systems has been extensively studied from the perspective of next-generation quantum devices. Recently, the flat-band concept has greatly expanded the material space of correlated electron physics. FeSb2 is a 3d transition metal compound that exhibits Kondo insulator-like orbital-selective correlations and has been suggested to host metallic surface states. However, their nature within the underlying correlated physics and controllability remain unexplored.
Using MBE-grown FeSb2 thin films in electric double-layer transistor (EDLT) devices, we discover an electric-field-induced magnetic phase transition arising from flat-band-driven strong correlations, revealing the strongly correlated nature of its two-dimensional surface and demonstrating its electrical controllability. We also discuss the surface states from the perspective of topological polarization, characterized by the Zak phase.
Using MBE-grown FeSb2 thin films in electric double-layer transistor (EDLT) devices, we discover an electric-field-induced magnetic phase transition arising from flat-band-driven strong correlations, revealing the strongly correlated nature of its two-dimensional surface and demonstrating its electrical controllability. We also discuss the surface states from the perspective of topological polarization, characterized by the Zak phase.