Hour: From 12:00h to 13:30h
Place: ICFO Auditorium
FRANCISCO GUINEA
"ELECTRON-ELECTRON INTERACTIONS AND SUPERCONDUCTIVITY IN TWISTED BYLAYER GRAPHENE AND RELATED MATERIALS"
By Francisco Guinea (Imdea Nanoscience, Madrid, Spain & Donostia International Physics Center, San Sebastián, Spain)
BIOGRAPHY:
Born in Madrid, Spain, January 29th, 1953. B. Sc. Universidad Complutense de Madrid, 1975. Ph. D. Universidad Autónoma de Madrid, 1980. Current employer, Imdea Nanociencia, Madrid, Spain, and Donostia International Physics Center, San Sebastian, Spain. Theoretical condensed matter physicist, with contributions to many areas, including statistical mechanics and materials science.
ABSTRACT:
The effect of electron-electron interactions in twisted bilayer graphene is enhanced by the narrowness of the central bands, and by the complexity of the electronic wavefunctions. The long-range electrostatic interaction is the strongest coupling in twisted bilayer graphene. The way in which this interaction determines the phase diagram of twisted bilayer graphene will be discussed. Long wavelength charge fluctuations, modified by the Coulomb interaction, and also by longitudinal acoustic phonons, can lead to a net attraction, even at long distances, and contribute to the existence of superconductivity. Comparison between twisted bilayer graphene and other graphitic systems with narrow bands will also be presented.
Hour: From 12:00h to 13:30h
Place: ICFO Auditorium
FRANCISCO GUINEA
"ELECTRON-ELECTRON INTERACTIONS AND SUPERCONDUCTIVITY IN TWISTED BYLAYER GRAPHENE AND RELATED MATERIALS"
By Francisco Guinea (Imdea Nanoscience, Madrid, Spain & Donostia International Physics Center, San Sebastián, Spain)
BIOGRAPHY:
Born in Madrid, Spain, January 29th, 1953. B. Sc. Universidad Complutense de Madrid, 1975. Ph. D. Universidad Autónoma de Madrid, 1980. Current employer, Imdea Nanociencia, Madrid, Spain, and Donostia International Physics Center, San Sebastian, Spain. Theoretical condensed matter physicist, with contributions to many areas, including statistical mechanics and materials science.
ABSTRACT:
The effect of electron-electron interactions in twisted bilayer graphene is enhanced by the narrowness of the central bands, and by the complexity of the electronic wavefunctions. The long-range electrostatic interaction is the strongest coupling in twisted bilayer graphene. The way in which this interaction determines the phase diagram of twisted bilayer graphene will be discussed. Long wavelength charge fluctuations, modified by the Coulomb interaction, and also by longitudinal acoustic phonons, can lead to a net attraction, even at long distances, and contribute to the existence of superconductivity. Comparison between twisted bilayer graphene and other graphitic systems with narrow bands will also be presented.