Sponsoring Units: DCMP,GMAGChair: Salvador Barraza-Lopez, University of Arkansas
Wed. March 6, 12:18 p.m. – 12:30 p.m. CST
L100J
Bernal bilayer graphene (BLG) coupled to tungsten diselenide (WSe2) features an extraordinary order-of-magnitude enhancement in superconducting Tc and establishes an ultra-clean platform for exploring various correlated ground states. Here, we show that by controlling the interfacial twist angle between BLG and WSe2, the proximitized spin-orbit coupling (SOC) as well as overall BLG phase diagram can be tuned. We map out the superconducting regions and find that superconductivity exhibits a higher Tc and onsets at higher displacement fields when Ising SOC is increased. Moreover, we discover multiple superconducting regions emerging from various broken-symmetry parent phases. By carefully mapping quantum oscillations, we further establish the dependence of nematic broken flavor symmetry on doping and the Ising strength. Our results pave the way for a detailed understanding of unconventional pairing in graphene superconductors.
Presented By
Yiran Zhang (California Institute of Technology)
Authors
Yiran Zhang (California Institute of Technology)
Gal Shavit (California Institute of Technology)
Etienne Lantagne-Hurtubise (Caltech)
Alex Thomson (Caltech)
Cyprian K Lewandowski (Florida State University)
Kenji Watanabe (National Institute for Materials Science)
Takashi Taniguchi (Kyoto Univ)
Jason F Alicea (Caltech)
Felix von Oppen (Berlin)
Yuval Oreg (Weizmann Institute of Science)
Stevan Nadj-Perge (Caltech)
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Tuning Superconductivity in Spin-Orbit Bernal Bilayer Graphene by Interfacial Twisting
Wed. March 6, 12:18 p.m. – 12:30 p.m. CST
L100J
Bernal bilayer graphene (BLG) coupled to tungsten diselenide (WSe2) features an extraordinary order-of-magnitude enhancement in superconducting Tc and establishes an ultra-clean platform for exploring various correlated ground states. Here, we show that by controlling the interfacial twist angle between BLG and WSe2, the proximitized spin-orbit coupling (SOC) as well as overall BLG phase diagram can be tuned. We map out the superconducting regions and find that superconductivity exhibits a higher Tc and onsets at higher displacement fields when Ising SOC is increased. Moreover, we discover multiple superconducting regions emerging from various broken-symmetry parent phases. By carefully mapping quantum oscillations, we further establish the dependence of nematic broken flavor symmetry on doping and the Ising strength. Our results pave the way for a detailed understanding of unconventional pairing in graphene superconductors.
Presented By
Yiran Zhang (California Institute of Technology)
Authors
Yiran Zhang (California Institute of Technology)
Gal Shavit (California Institute of Technology)
Etienne Lantagne-Hurtubise (Caltech)
Alex Thomson (Caltech)
Cyprian K Lewandowski (Florida State University)
Kenji Watanabe (National Institute for Materials Science)