Isospin magnetism and spin-polarized superconductivity in Bernal bilayer graphene

Zhou, Haoxin; Holleis, Ludwig; Saito, Yu; Cohen, Liam; Huynh, William; Patterson, Caitlin L.; Yang, Fangyuan; Taniguchi, Takashi; Watanabe, Kenji; Young, Andrea F.

doi:10.1126/science.abm8386

Title: Isospin magnetism and spin-polarized superconductivity in Bernal bilayer graphene

Journal Article · 13 January 2022 · Science

DOI: https://doi.org/10.1126/science.abm8386 · OSTI ID:1980741

^[1];

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^[2]; Huynh, William ^[2]; Patterson, Caitlin L. ^[2]; Yang, Fangyuan ^[2];

^[3];

^[2]

University of California, Santa Barbara, CA (United States); OSTI
University of California, Santa Barbara, CA (United States)
National Institute for Materials Science, Tsukuba (Japan)

In conventional superconductors, Cooper pairing occurs between electrons of opposite spin. We observe spin-polarized superconductivity in Bernal bilayer graphene when doped to a saddle-point van Hove singularity generated by a large applied perpendicular electric field. We observe a cascade of electrostatic gate-tuned transitions between electronic phases distinguished by their polarization within the isospin space defined by the combination of the spin and momentum-space valley degrees of freedom. Although all of these phases are metallic at zero magnetic field, we observe a transition to a superconducting state at finite magnetic field B_∥≈ 150 milliteslas applied parallel to the two-dimensional sheet. Superconductivity occurs near a symmetry-breaking transition and exists exclusively above the B_∥ limit expected of a paramagnetic superconductor with the observed transition critical temperature T_C ≈ 30 millikelvins, consistent with a spin-triplet order parameter.

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Research Organization:: University of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Army Research Office (ARO); Gordon and Betty Moore Foundation; Packard Foundation; Ministry of Education, Culture, Sports, Science and Technology (MEXT); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0020043

OSTI ID:: 1980741

Journal Information:: Science, Journal Name: Science Journal Issue: 6582 Vol. 375; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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