Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session L49: The Superconductor-Insulator Transition: Beyond Universal Scaling
8:00 AM–11:00 AM,
Wednesday, March 17, 2021
Sponsoring
Unit:
DCMP
Chair: Norman Armitage, Johns Hopkins University
Abstract: L49.00004 : Absence of a Dissipative Quantum Phase Transition in Josephson Junctions*
9:48 AM–10:24 AM
Live
Presenter:
Philippe Joyez
(Quantronics group, SPEC, CEA-Saclay)
Author:
Philippe Joyez
(Quantronics group, SPEC, CEA-Saclay)
Although the understanding of all the above Josephson devices is exquisitely accurate, here we show that, surprisingly, the interaction of a Josephson junction with a high-resistance electromagnetic environment was long misconceived and inconsistent. Specifically, we show experimentally that, contrary to what is commonly believed, a Josephson junction connected to a resistor does not become insulating above some value of the resistance due to a dissipative quantum phase transition.
We propose a new theoretical analysis which accounts for our observation and resolves previous inconsistencies in the theory. This reveals a subtle difference between this system and others, previously thought equivalent, in which a phase transition was confirmed.
[1] Murani et al., Phys. Rev. X 10, 021003 (2020).
*This work was supported in part by French ANR Grants No. ANR-15-CE30-0021-01, ANR-18-CE47-0014-01, the ANR-DFG Grant JosephSCharli, the LabEx PALM Project No. ANR-10-LABX-0039-PALM, the European Research Council Grant Agreement No. 639039. the German Science Foundation Grant No. AN336/11-1 and Baden-Württemberg IQST.
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