Evolution of the Kondo lattice electronic structure above the transport coherence temperature
일 시 : 2021년 10월 07일 목요일 16:00
연 사 : 심 지 훈 교수 (포항공과대학교 화학과)
장 소 : 온라인 진행 ( https://us02web.zoom.us/j/81101834598?pwd=RkZIdXJLL1lOWXBjamc2Ylg3VUtRZz09 )
HOST : 신 상 진 교수님
초 록
The temperature-dependent evolution of the Kondo lattice is a long-standing topic of theoretical and experimental investigation and yet it lacks a truly microscopic description of the relation of the basic f-d hybridization processes to the fundamental temperature scales of Kondo screening and Fermi-liquid lattice coherence. In this talk, the temperature-dependence of f-d hybridized band dispersions and Fermi-energy f spectral weight in the Kondo lattice system CeCoIn5 is investigated using first principles dynamical mean field theory (DMFT) calculations containing full realism of crystalline electric field states. All the calculated results are directly compared to f-resonant angle-resolved photoemission (ARPES). Our results reveal f participation in the Fermi surface at temperatures much higher than the lattice coherence temperature, T∗≈ 45 K, commonly believed to be the onset for such behavior. The identification of a T-dependent crystalline electric field will be discussed with its contribution to T∗ as well as local Kondo temperature TK.
References
[1] Sooyoung Jang, J. D. Denlinger, J. W. Allen, V. S. Zapf, M. B. Maple, Jae Nyeong Kim, Bo Gyu Jang, Ji Hoon Shim, PNAS 117, 23467 (2020).