Publications (9)
Signature of the Leggett mode in the A1g Raman response: from MgB2 to iron-based superconductors
T. Cea, L. Benfatto
The Raman response in a superconductor is a powerful probe to investigate the symmetry of the superconducting gap. Here we show that in a multiband superconductor it also offers th…
Polarization dependence of the third-harmonic generation in multiband superconductors
T. Cea, P. Barone, C. Castellani +1
In a superconductor the third-harmonic generation (THG) of a strong THz pulse is enhanced below Tc by the resonant excitation of lattice-modulated charge fluctuations (LCF), which…
Piezoelectricity in monolayer hexagonal boron nitride
P. Ares, T. Cea, M. Holwill +7
Two-dimensional (2D) hexagonal boron nitride (hBN) is a wide-bandgap van der Waals crystal with a unique combination of properties, including exceptional strength, large oxidation…
Optical excitation of phase modes in strongly disordered superconductors
T. Cea, D. Bucheli, G. Seibold +3
According to the Goldstone theorem the breaking of a continuous U(1) symmetry comes along with the existence of low-energy collective modes. In the context of superconductivity the…
Comment on: Calculation of an Enhanced Symmetry Mode Induced by Higgs Oscillations in the Raman Spectrum of High-Temperature Cuprate Superconductors
L. Benfatto, C. Castellani, T. Cea
In a recent manuscript Phys. Rev. Lett. 127, 197001 (2021) Puviani et al. claim that the Higgs mode gives an enhancement of the Raman response in the symmetric Raman chann…
Heterostrain rules the flat-bands in magic-angle twisted graphene layers
F. Mesple, A. Missaoui, T. Cea +5
The moiré of twisted graphene bilayers can generate flat bands in which charge carriers do not posses enough kinetic energy to escape Coulomb interactions with each other leading…