Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q44: BCS-BEC Crossover in Quantum Materials
3:00 PM–5:24 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-375C
Sponsoring Units: DCMP DMP
Chair: Andrey Chubukov, University of Minnesota
Abstract: Q44.00002 : Gate-controlled BCS-BEC crossover in a two-dimensional superconductor*
3:36 PM–4:12 PM
(Univ of Tokyo)
(Univ of Tokyo)
We have succeeded in controlling the carrier density by nearly two-orders of magnitude, and establishing an electronic phase diagram through the simultaneous experiments of resistivity and tunneling spectra on the ionic gating devices. We found Tc exhibits dome-like behavior, and more importantly, a wide pseudogap phase in the low doping regime. In the low carrier density limit, Tc scales as Tc/TF = 0.12, where TF is the Fermi temperature, which shows fair agreement with the theoretical prediction for the 2D BEC-BEC crossover. Furthermore, through the systematic Hall effect measurements, we have clarified the evolution of vortex dynamics along the crossover combined with the time-dependent Ginzburg-Landau theory. These results demonstrate that the Li intercalated ZrNCl and its gate-controlled superconductivity are ideal platforms towards investigations of unexplored properties in BEC superconductors.
*This work is supported by A3 Foresight Program and JSPS KAKENHI grants JP19H05602.
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