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날짜 2024-06-12 13:30 
일시 Jun 12th (Wed), 13:30pm 
장소 E6, #1501 
연사 Dr. Jun Ho Son (Cornell University) 
아래와 같이 세미나를 개최하고자 하오니, 관심있는 분들의 많은 참석 부탁드립니다.
 
Date: 13:30 pm, 12th Jun (Wed)
Place: E6, #1501
Speaker: Dr. Jun Ho Son (Cornell University)
Title: Competition between superconductivity and density waves in spin-degenerate and spin-orbit-coupled Bernal bilayer graphene
Abstract: 

Inspired by recent observations of the absence and presence of superconductivity in Bernal-stacked bilayer graphene (BBG) and BBG-WSe2 heterostructure, we investigate all possible competing instabilities driven by van Hove singularities (vHS) near the Fermi level in spin-degenerate and spin-split BBG. By performing a parquet renormalization group analysis in both systems, we identify an incommensurate intra-valley charge density wave (CDW) as the dominant instability in spin-degenerate BBG. Moreover, we find that lifting the spin degeneracy by the Ising spin-orbit coupling from the WSe2 monolayer or by applying an in-plane magnetic field restores superconductivity as the primary instability since intra-valley CDW is suppressed when the vHS are spin-polarized. We also discuss future experiments to confirm our proposed scenarios.

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