발전기금
[행사/세미나] 고체전자구조계산연구실 세미나 안내(2026.04.13, 16:30, 31317)
- 물리학과
- 조회수866
- 2026-04-10
안녕하세요, 물리학과 사무실입니다.
고체전자구조계산 연구실에서 다음과 같이 세미나를 진행하오니 많은 관심과 참여 부탁드립니다.
- 일시: 2026.04.13.월 16:30
- 장소: (제1과학관 31317호실) Natural Sciences 1, 31317, SKKU
- 제목: Rich competing charge density wave landscape in kagome quantum materials- 연사: 김선우 교수님 (한양대학교 물리학과)
- 내용:Charge density waves (CDWs), periodic modulations of charge density arising from electron-electron interaction and/or electron-phonon coupling, have been central themes of modern condensed matter physics. They have been extensively studied in a wide range of materials, including transition metal dichalcogenides, cuprates, and nickelates. More recently, kagome metals have emerged as a particularly intriguing platform, hosting competing CDWs with unconventional properties such as time-reversal symmetry breaking and strong interplay with superconductivity and nematicity.In this talk, I will present our recent theoretical studies on competing CDW orders in bilayer kagome metals, focusing on ScV 6 Sn 6 [1] and the newly synthesized ANb 6 X 6 family (A: rare earth, X: p-block elements) [2]. For ScV 6 Sn 6 , we develop a microscopic theory of competing CDW orders based on density functional theory combined with anharmonic phonon-phonon interactions. Our results predict a temperature-driven phase transition from a high-temperature CDW to the low-temperature CDW order, fully explaining experimental observations and resolving existing controversies. Furthermore, we construct phase diagrams that demonstrate how the competition between these orders can be tuned. Extending our study to ANb 6 X 6 , we uncover a remarkably rich CDW landscape with four distinct competing orders. We show that the A-site primarily controls out-of-plane CDW correlations, while the X-site tunes in-plane CDW correlations, leading to a diverse set of competing orders. Overall, these results establish 166 bilayer kagome metals as a versatile platform for studying the competition between CDW orders and their interplay with emergent many-body quantum phases, including nematicity and possible time-reversal symmetry breaking states, as recently observed in ScV 6 Sn 6 .