서울대학교 응용물리연구소

세미나

IAP Seminar (Orbital texture effects in electronic transport)

2022-06-30l 조회수 309
일시 : 2022-06-30 14:00 ~ 15:00
연사 : Dr. Kyoung0Whan Kim(Center for Spintronics, KIST)
담당 : Prof. Sug-Bong Choe)
장소 : 23-317
Nontrivial electronic structures in the crystal momentum space have received great attention in modern condensed matter physics. For instance, nonuniform phase of an electronic wave function in the momentum space may give rise to a nonzero Berry curvature and corresponding anomalous Hall transport. Similarly, if an electronic structure forms a spin texture in the momentum space, it may result in so-called the spin Berry curvature and the corresponding spin Hall effect, which are not only fundamentally interesting but also promising for the next generation device applications. Since the spin degree of freedom does not directly couple to the position and momentum degrees of freedom, taking into account the orbital degree of freedom is crucial. The purpose of this talk is to shed light on the general understanding of anomalous electronic transport by considering the orbital degree of freedom. In particular, I would like to emphasize the roles of orbital texture in electronic transport. The orbital texture is an orbital version of spin texture, but its understanding requires a far deeper concept, the orbital angular position and the orbital torsion, which are results of algebraic difference between the spin and orbital angular momentum operators. After introducing the orbital texture, I would like to present how to model the orbital texture, the microscopic origins of orbital texture, and its various effects on the orbital, spin, and charge transport.