Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D27: Superconductivity:Low Dimensional-I
3:00 PM–5:48 PM,
Monday, March 6, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Yafis Barlas, University of Nevada, Reno
Abstract: D27.00002 : Geometric Contribution to the Superfluid Density in Inversion Asymmetric Bilayer Graphene*
3:12 PM–3:24 PM
Presenter:
Yafis Barlas
(University of Nevada, Reno)
Authors:
Yafis Barlas
(University of Nevada, Reno)
Enrico Rossi
(William & Mary)
Xiang Hu
(William & Mary)
The $mathcal{C}_2$ symmetry is broken by applying a displacement field perpendicular to the sample and results in a finite mass term $m$. The mass term leads to an enhancement of the superconductivity and exciton superfluid gap in bilayer graphene. We calculate the superfluid weight, which consists of two terms i) conventional contribution and ii) geometric contribution. The geometric contribution emerges from the quantum metric of the electron-hole bands. We find that the geometric contribution can be significantly enhanced by a finite mass term, and we show the effect of this enhancement on the Kosterlitz-Thouless transition temperature.
*E.R. acknowledges support from DOE-BES, Grant DOE DE-SC0022245
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