Chiral anomaly effect in electrical transport of Bi0.96Sb0.04
일 시 : 2020년 11월 14일 화요일 16:00
연 사 : 김 헌 정 교수 (대구대 물리학과)
장 소 : 자연과학관 B117호
초 록
As an exotic metallic state, the three-dimensional (3D) Weyl metal has pairs of Weyl nodes in the k space and shows topological surface state known as Fermi arcs and anomalous electrical transport originating from chiral anomaly. Ever since observed in Bi0.96Sb0.04, which becomes a 3D Weyl metal in parallel electric (E) and magnetic (B) fields, the negative longitudinal magnetoresistance had been the only transport signature of this exotic metallic state, also observable in TaAs, Na3Bi, Cd3As2 and so on. As another indisputable fingerprint for existence of chiral anomaly, violation of Ohm’s law was reported in Bi0.96Sb0.04 inthe longitudinal configuration (E//B). In this talk, I will discuss how violation of Ohm’s law becomes direct evidence of chiral anomaly. Violation Ohm’s law in Weyl metal is also expected to open a door to possible invention of a novel nonlinear electronic component at low frequencies.