Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S16: Novel Effects in Josephson Junctions
8:00 AM–11:00 AM,
Thursday, March 7, 2024
Room: M100G
Sponsoring
Unit:
DCMP
Chair: Lior Shani
Abstract: S16.00002 : Artificial flat bands in frustrated Josephson junction arrays based on a superconductor/semiconductor hybrid platform
8:12 AM–8:24 AM
Presenter:
Luca Banszerus
(Center for Quantum Devices, University of Copenhagen)
Authors:
Luca Banszerus
(Center for Quantum Devices, University of Copenhagen)
William Marshall
(University of Washington)
Tyler Lindemann
(Purdue University)
Michael J Manfra
(Purdue University)
Saulius Vaitiekenas
(Niels Bohr Institute)
Charles Marcus
(University of Copenhagen)
When applying a perpendicular magnetic field, frustration is introduced, leading to complex ground states, which depend on the geometry of the array. I will present data recorded in a two-dimensional Josephson junction array with dice lattice geometry, which is predicted to host flat bands when frustrated. I will discuss our recent effort to map out the phase diagram as a function of frustration. Commensurate values of frustration lead to the formation of vortex lattices, which are absent at incommensurate values of frustration. When frustrating the array with half a flux quantum per array plaquette, quantum interference localizes individual Cooper pairs on the array, corresponding to formation of a flat band system.
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