Gian Marcello Andolina, JEIP, CNRS - Collège de France

The next LPEM seminar (hybrid format) will be given Thursday March 30 at 2:00 pm (Paris time)

The seminar will take place in a hybrid format at ESPCI, Room Holweck, Building C, 1st Floor.

Can deep sub-wavelength cavities induce Amperean superconductivity in a 2D material ?

Amperean superconductivity is an exotic phenomenon stemming from attractive effective electron-electron interactions (EEEIs) mediated by a transverse gauge field. Originally introduced in the context of quantum spin liquids and high-Tc superconductors, Amperean superconductivity has been recently proposed to occur at temperatures on the order of 1-20 K in two-dimensional, parabolic-band, electron gases embedded inside deep sub-wavelength optical cavities.
I will first generalize the microscopic theory of cavity-induced Amperean superconductivity to the case of graphene and then argue that this superconducting state cannot be achieved in the deep sub-wavelength regime. In the latter regime, indeed, a cavity induces only EEEIs between density fluctuations rather than the current-current interactions which are responsible for Amperean pairing.

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Etienne Maréchal, LPEM-ESPCI.

23 janvier 2020 à 14h,Amphi Boreau Escalier c, 2 eme ètage. Étude du magnétisme quantique avec des atomes froids : Dans ce séminaire, je présenterai (...) 

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