행사 상세 정보 :

 1. 일시: 2026년 5월 08일 (금) 오후 1시 30분 -3시

2. 장소 :교육융합관 303호

3. 문의: 한정우 교수 (물리교육과, 062-530-2483)

4. 연사 및 주제

Chiraltronics: From Ultrafast Symmetry Control to Quantum Materials

In Hyoek Choi

Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139, United States

Collective ionic rotations, known as axial chiral or achiral phonons, can carry pseudo-angular momentum in quantum materials. These novel quasiparticles can excite both resonantly and off-resonantly, thereby enabling angular momentum transfer between quantum and classical systems. Beyond serving as angular momentum carriers, chiral phonons open new opportunities for chirality-selective thermotronic applications, including the chiral phonon diode effect and the chiral phonon Seebeck effect, providing additional degrees of freedom for device functionality. In this talk, I will discuss how chiral symmetry in lattice degrees of freedom can be broken through thermal, optical, and structural driving methods in oxide systems, and present observations of their ultrafast dynamics.