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고체전자구조계산연구실에서 카이스트 물리학과의 박문집 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.

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○ Date/time: 2020. 11. 5 (Thu.) 14:00

 

○ Place: 제1과학관 31214 e+첨단강의실

 

○ Speaker: 박  문  집  박사님 (카이스트, 물리학과)

 

○ Title: Higher Spin Cooper Pairs

 

○ Abstract: Among various many-body interactions in solid-state matters, electron-electron Hubbard interaction is the most evidently existing, but simultaneously the most elusive form of interaction for superconductivity. This is because the repulsive nature of electron-electron interaction is inadequate to serve as the source of superconducting pairings. Simply saying, the repulsive interaction does not glue Cooper pairs. In this work, we show that the confluence of the strong spin-orbit coupling completely changes the picture. By exemplifying the spin-orbit-coupled Mott insulator GaTa4Se8 whose strong spin-orbit coupling drives j=3/2 multiband nature of molecular states. We identify the particular pairing channel even with the repulsive origin. Intriguingly, this particular channel is characterized by ‘spin-2 Cooper pair’, which would not be possible without the aid of spin-orbit coupling.  Furthermore, we show that its Bogoliubov quasiparticles and their surface states exhibit non-trivial topological properties. To verify our theory, we propose novel experimental signatures that can be measured by Josephson junction transport and scanning tunneling microscope.

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