Strongly disordered superconductors

Benjamin Sacépé

The interplay between disorder and superconductivity is a fundamental problem of condensed matter physics. Upon increasing disorder or magnetic field it is indeed possible to induce in a thin superconducting film a continuous quantum phase transition from a superconducting state to an insulating state led by the localization of electron pairs. Such zero-temperature transition, which involves Cooper pairs as charge carriers, provides a prototypical system to address the physics of the quantum localization of interacting bosons in disordered media. In this field we mainly focused our research on thin films of amorphous indium oxide, which exhibits a sharp superconductor-to-insulator transition. On the superconducting side of the transition, we have performed in close collaboration with C. Chapelier at INAC, the pioneering mK-STM spectroscopy study of the superconducting gap. Our work has demonstrated that Cooper pairs are not suppressed at the critical disorder but persist in insulators forming localized electron bound pairs. Beyond the critical disorder or critical magnetic field, the insulator that terminates superconductivity is attracting considerable interest due to mounting evidences that the charge carriers in it are electron pairs. In collaboration with D. Shahar from the Weizmann Institute of Science, we have performed magneto-transport studies on thin films. These experiments on insulators focus on the electron-phonon coupling in non-linear transport and on the possible many-body localization of charge carriers in this peculiar insulating state.

For more information on this activity, click here.

Workshop SIT 2018

Quantum Electronic Circuits Alps - QuantECA

Quantum Electronic Circuits Alps - QuantECA

Quantum phenomena in electronic circuits : from model systems to large scale integration.
Helium : from fundamental to applications - HELFA

Helium : from fundamental to applications - HELFA

Helium as model system, hydrodynamic and turbulence, space and astrophysics, instrumentation and cryogenic development, kinetic inductance detectors.
Magnetism and Superconductivity - MagSup

Magnetism and Superconductivity - MagSup

Team Magnetism and Superconductivity at Institut NEEL - Systems involving charge, spin or lattice degrees of freedom.
Optics and materials - OPTIMA

Optics and materials - OPTIMA

a complete chain of competences that goes from the design and elaboration of new materials to the study of nonlinear optical properties and plasmonics
Materials, Radiations, Structure - MRS

Materials, Radiations, Structure - MRS

Understanding of the physico-chemical properties of complex materials based on the precise description of their structure
Micro and NanoMagnetism - MNM

Micro and NanoMagnetism - MNM

Complementary expertise in fabrication, characterisation, and simulations for studies in nanomagnetism with applications in spin electronics and micro-systems
Quantum Nano-Electronics and Spectroscopy - QuNES

Quantum Nano-Electronics and Spectroscopy - QuNES

Electron transport and local spectroscopy of quantum structures
Nano-Optics and Forces - NOF

Nano-Optics and Forces - NOF

Nano - optics and forces
Nanophysics and Semiconductors - NPSC

Nanophysics and Semiconductors - NPSC

Growth of III-V and II-VI semiconductor nanostructures and their physics in search of new functions for potential applications.
Wide bandgap semiconductors - SC2G

Wide bandgap semiconductors - SC2G

Physics of diamond and other wide bandgap semiconductors towards applications in electronics and biotechnologies
Surfaces, Interfaces and Nanostructures - SIN

Surfaces, Interfaces and Nanostructures - SIN

Experimental and theoretical studies of low dimensional systems
Hybrid systems at low dimensions - HYBRID

Hybrid systems at low dimensions - HYBRID

Electronic, optical, vibrational, mechanical properties, as well as their interplay at the nanoscale, of novel hybrid systems (nanotubes, graphene, two-dimensional and functionalized materials) which are developed by the group .
Condensed Matter Theory - TMC

Condensed Matter Theory - TMC

Theoretical research related to quantum materials and first-principles theory. >> read more
Thermodynamics and Biophysics of small systems - TPS

Thermodynamics and Biophysics of small systems - TPS

Ultra-sensitive instrumentation for electrical and thermal measurements: from biophysics to low temperature condensed matter physics.
Theory of Quantum Circuits - ThQC

Theory of Quantum Circuits - ThQC

Theoretical studies of electronic transport in nanometer-scale devices showing remarkable quantum effects.
Ultra-low temperatures - UBT

Ultra-low temperatures - UBT

Quantum physics at the ultra-low temperature frontier.
© Institut Néel 2012 l Webdesign chrisgaillard.com l Powered by spip l Last update Thursday 5 December 2019 l