15th Quantum Matter Luncheon Seminar
4/27 (Thu.) Start at 12:15
Speaker: Dr. Yigui Zhong
Affiliation: Okazaki group in LASOR
Title: Exploring Electron Pairing Symmetry in CsV3Sb5-Derived Kagome
Superconductors Utilizing Ultrahigh Resolution laser-ARPES
Abstract:
The newly discovered kagome superconductors AV3Sb5 (A=K, Rb, Cs)
represent a promising platform for investigating the interplay between
band topology, electronic order, and lattice geometry [1, 2]. Despite
extensive research efforts on this system, the nature of the
superconducting ground state remains elusive and a consensus on the
electron pairing symmetry has not been achieved so far. In this talk,
I will report our ultrahigh resolution and low-temperature
angle-resolved photoemission spectroscopy (ARPES) studies on two
exemplary CsV3Sb5-derived kagome superconductors — Cs(V0.93Nb0.07)3Sb5
with the appearance of charge order and Cs(V0.86Ta0.14)3Sb5 without
charge order in the normal state [3]. Additionally, I will present our
studies of electronic kinks in the band structure [4] and
temperature-dependent muon spin relaxation rate, and discuss the
possible pairing mechanisms for these kagome superconductors. Overall,
our findings contribute to a better understanding of the nature of
superconductivity and its intertwined orders in kagome quantum
materials.
References:
[1] Neupert, T. et al., Nature Physics 18, 137 (2021).
[2] Yin et al., Nature 612, 647-657 (2022).
[3] Zhong, Y. et al., Nature (in press), arXiv:2303.00875.
[4] Zhong. Y. et al., Nat. Commun. 14, 1945 (2023), arXiv:2207.02407.
