SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Poster Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology
TT 22.1: Poster
Donnerstag, 30. September 2021, 13:30–16:00, P
Superinsulators: "localization" and granularity without disorder — •cristina diamantini1 and carlo trugenberger2 — 1Department of Physics and Geology, University of Perugia, via Pascoli snc, Perugia, Italy — 2SwissScientific Technologies SA, rue du Rhone 59, Geneva, Switzerland
It is often believed that suppression of transport in condensed matter systems requires many-body localization (MBL) by strong disorder. There is by now, however a vast body of literature showing that this is not the case: MBL-like phenomena can arise in absence of disorder by confinement, the phenomenon preventing quarks to "exit" from protons. I will discuss the example of the superinsulators, a new state of matter where condensation of magnetic monopole instantons generates an "endogenous emergent disorder" leading to an infinite resistance (even at finite temperatures) by the confinement of electric charge, Cooper pairs playing the role of quarks. The granularity of these materials around the superconductor-to-superinsulator transition is also emergent, due to the competition of two quantum phase transitions and is not due to disorder. I will present recent experimental evidence that rules out disorder-driven MBL as a cause of the infinite resistance, while confirming its endogenous instanton origin.