Correlations in Novel Quantum Materials 2022 (CNQM2022)

Session

Quantum Criticality and Superconductivity

20 Jun 2022, 08:55

2D5 (Max Planck Institut für Festkörperforschung)

49. Interplay Between Superconductivity and Non-Fermi Liquid at a QCP in a Metal

Prof. Andrey Chubukov (GNOI)

20/06/2022, 09:00

Keynote Talk / Invited Talk

I discuss the interplay between non-Fermi liquid behavior and pairing near a quantum-critical point (QCP) in a metal. These tendencies are intertwined in the sense that both originate from the same interaction mediated by gapless fluctuations of a critical order parameter. The two tendencies compete because fermionic incoherence destroys the Cooper logarithm, while the pairing eliminates...

71. Superconductivity in Dilute Quantum Critical Polar Metals

Premala Chandra (Rutgers University)

20/06/2022, 09:45

Keynote Talk / Invited Talk

Superconductivity in low carrier density metals challenges the conventional electron-phonon theory due to the absence of retardation required to overcome Coulomb repulsion. Here I will discuss how pairing mediated by energy fluctuations, ubiquitously present close to continuous phase transitions, occurs in dilute quantum critical polar metals and results in a dome-like dependence of the...

20. Nematic d-wave superconductivity in magic-angle twisted bilayer graphene from atomistic modeling

Annica Black-Schaffer (Uppsala University)

20/06/2022, 10:45

Keynote Talk / Invited Talk

Bilayer graphene at certain small internal twist angles develops large scale moiré patterns with flat energy bands hosting correlated insulating states and superconductivity. The large system size and intricate band structure have however hampered investigations into the properties of the superconducting state. By using full-scale atomistic modeling with local electronic interactions,...

48. Superconductivity without quasiparticles: Quantum critical Eliashberg theory and its holographic dual

Jörg Schmalian (Karlsruhe Institute of Technology)

20/06/2022, 11:15

Keynote Talk / Invited Talk

Superconductivity is abundant near quantum-critical points, where fluctuations suppress the formation of Fermi liquid quasiparticles and the Bardeen-Cooper-Schrieffer theory no longer applies. Two very distinct approaches have been developed to address this issue: quantum-critical Eliashberg theory and holographic superconductivity. The former includes a strongly retarded pairing interaction...