3-particle mechanism for pairing and superconductivity


Fu, L. (2021). 3-particle mechanism for pairing and superconductivity. Perimeter Institute. https://pirsa.org/21040011


Fu, Liang. 3-particle mechanism for pairing and superconductivity. Perimeter Institute, Apr. 19, 2021, https://pirsa.org/21040011


          @misc{ pirsa_21040011,
            doi = {10.48660/21040011},
            url = {https://pirsa.org/21040011},
            author = {Fu, Liang},
            keywords = {Condensed Matter},
            language = {en},
            title = {3-particle mechanism for pairing and superconductivity},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {apr},
            note = {PIRSA:21040011 see, \url{https://pirsa.org}}

Liang Fu Massachusetts Institute of Technology (MIT) - Department of Physics


I will present a new  mechanism for superconductivity from strong electron-electron repulsion in multi-band systems. When the kinetic energy is small, the dynamics of nearby electrons on the lattice is strongly correlated. I will introduce a controlled expansion in the kinetic term to demonstrate pairing induced by correlated tunneling process involving a third electron in the occupied band. This mechanism can also be viewed as the real space picture of exciton-mediated pairing. Possible realization of this idea leading to strong-coupling, spin-triplet superconductivity in WTe2 and magic-angle graphene will be discussed.

Based on works with Valentine Crepel and Kevin Slagle:
[1] V. Crepel and L. Fu, arXiv:2012.08528
[2] V. Crepel and L. Fu, arXiv:2103.12060
[3] K. Slagle and L. Fu, Phys. Rev. B 102, 235423 (2020)