Subir Sachdev - Excitation spectra of compressible quantum matter without quasiparticles

Quantum Fluids in Isolation virtual seminar on Oct. 15th, 2020.

Sign up for future email notifications here:

Prof. Subir Sachdev, Harvard University

Abstract:

Many modern quantum materials display regimes with variable electron density without well-defined quasiparticle excitations. In various solvable models with variable spin and/or charge density, related to the Sachdev-Ye-Kitaev model, the excitation spectra are characterized by infinite sets of operators, almost all with irrational scaling dimensions. I will compare the spectral functions so obtained with numerical studies of random t-J and Hubbard models. The operator associated with time reparameterization symmetry contributes a linear-in-temperature term to the resistivity of a wide class of models.