Physics at Virginia

"Ising Superconductivity and Nematicity in Bernal Bilayer Graphene with Strong Spin-Orbit Coupling"

Ludwig Holleis , University of California Santa Barbara
[Host: Bellave Shivaram]

Superconductivity is an almost ubiquitous feature in the low temperature phase diagram of multilayer graphene allotropes – moire or crystalline. While the microscopic electronic structures of these systems differ, supporting devices with monolayer WSe2 has been shown to increase superconductivity along many axes of the phase space like density, magnetic field and temperature. Here, we study two superconducting domes (SC1 and SC2) in Bernal Bilayer graphene on WSe2 in light of their resilience to in-plane magnetic fields. While SC1 appears in a symmetry unbroken phase, quantum oscillation measurements show that the normal state of SC2 is nematic, breaking C3 symmetry. Despite this difference, both superconductors violate the Pauli limit consistent with spin singlet pairing between opposite valleys protected from de-pairing by Ising SOC. Our results suggest that the induced SOC is central to the observed enhancement of superconductivity in many graphene multilayer systems - favoring pairing between time reversal symmetric partners.

Condensed Matter Seminar
Thursday, November 30, 2023
3:30 PM
Clark Hall, Room G004
Note special room.

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