안녕하세요.
10월 30일 진행되는 물리학과 세미나 안내드립니다.
일시: 2025.10.30.(목) 16:30-17:30
장소: 베어드홀 1층, 01103호
연사: 이원용 교수(강원대 반도체 물리학과)
제목: Thermoelectric and Spin-Caloritronic Frontiers in Two-Dimensional TMDCs: Interfaces, Symmetry, and Berry Curvature
초록:
Two-dimensional transition-metal dichalcogenides (2D TMDCs) have emerged as a dynamic platform for exploring the coupling between heat, charge, and spin degrees of freedom. Their atomically thin structure, strong spin–orbit interaction, and tunable band topology enable unprecedented control over how energy and information propagate across interfaces. By carefully designing van der Waals heterostructures, thermal and electrical transport can be engineered far beyond the limits of conventional bulk materials.
In this talk, I will present our recent efforts to uncover how interfacial coupling and symmetry breaking reshape thermoelectric and spin-caloritronic behaviors in 2D TMDC systems. The first part will focus on interface-engineered thermoelectric conversion in layered MoS₂ films, where nanoscale current confinement and carrier filtering give rise to enhanced in-plane thermoelectric performance and provide a pathway toward flexible, large-area energy-harvesting devices. The second part will address Berry curvature–driven spin and valley thermoelectricity in magnetic-proximity-coupled heterostructures such as Pt/WSe2/YIG. Here, the interplay of magnetic exchange and topological band curvature enables heat to generate spin and valley currents—an emerging class of thermoelectric phenomena that connect real-space magnetism with momentum-space topology.
These studies collectively demonstrate how manipulating interfaces and quantum geometry can transform simple 2D layers into multifunctional energy-conversion materials. Such findings point toward a unified framework of “thermo-spin-valley coupling,” offering new design principles for low-power spintronic circuits, on-chip thermal management, and quantum caloritronic devices.