[LECTURE] SPECIAL LECTURE(Sep.25 Thu. 16:00) (Dimi Culcer, UNSW Sydney)
- SAINT
- Hit1345
- 2025-09-19
09/25(목) 전문가초청특강은 The Univisity of the New South Wale의 Dimi Culcer 교수님을 모시고 진행합니다.
관심있는 분들의 많은 참석 부탁드립니다.
ㅁ주제: Non-equilibrium orbital dynamics in Bloch electron systems
ㅁ일시: 09/25(목) 16:00
ㅁ장소: 제2종합연구동 83188호
ㅁ약력:
Dimi Culcer's research interests include quantum information and computation, spin-orbit coupling and topological effects in condensed matter physics, quantum transport theory and nonlinear electrical and optical effects, with a focus on topological materials. He is actively working in all these areas.
ㅁ초록:
- In this talk I will discuss a series of insights into non-equilibrium phenomena involving the orbital angular momentum (OAM) of Bloch electron systems. Recent years have witnessed a surge of interest in the orbital angular momentum of Bloch electrons, motivated by its emerging applications in spintronics and magnetic memory [1]. Magnetic devices utilizing the orbital degree of freedom have the potential to achieve faster and lower power all-electrical operation than current state-of-the-art magnetic memory devices, and the OAM has been shown to be exceedingly long-lived in certain materials. In novel devices magnetic dynamics is driven by orbital torques, which can arise from the orbital magneto-electric effect (OME), a net steady state OAM density induced by an electric field, or the orbital Hall effect (OHE), that is, a net flow of OAM to the boundaries of the sample. At the same time, the OAM has generated considerable interest at the level of basic science. Whereas the equilibrium OAM in a clean system is well understood, fundamental questions surround the OAM of non-equilibrium Bloch electrons, and it is the non-equilibrium OAM that has motivated the recent focus on orbital dynamics. In out-of-equilibrium systems the microscopic physical and topological mechanisms leading to the orbital dynamics are not understood, the relative strengths of Fermi surface and Fermi sea contributions, as well as of intrinsic and extrinsic contributions, are not known, and a fundamental question has loomed over the field regarding the possibility of orbital effects being nonzero in the gap of an insulating material. My talk will address all these issues.