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Spectroscopy of Novel Quantum States

by Sebastien_Tanzilli - published on , updated on

Main contact: Tristan Cren
Other contact: Dimitri Roditchev

Research activities:

Our team focuses on emerging electronic phenomena in new correlated materials and nanostructures. We explore new quantum phases induced by the reduced dimensionality of the system, its peculiar electronic structure, or the controlled confinement of the wave function in nanostructures.

In the field of superconductivity, we have access to the characteristic scales and mechanisms responsible for the unconventional and “multigap” superconductivity or the superconductor-insulator transition.
We build in-situ nano-superconducting devices in which we confine vortices, merging in a giant vortex.
We also study new Mott insulators for which we control the metal-insulator transition at the nanoscale by STM.

Using scanning tunneling microscopy (STM) and spectroscopy (STS), we have access to both the topography of the surface of the material studied and its local electronic properties. We thus obtain a true mapping of the density of electronic states of a material, and observe its changes depending on the composition, nano-structuring, temperature or applied magnetic field. These state-of-the-art experiments are performed in extreme conditions, combining: UHV (10-11mbar), ultra-low temperature (up 280mK) and high magnetic field (up to 10 Tesla). To this end, we develop and build our own experimental apparatuses.

For more information: see online Spectroscopy of Novel Quantum States