2 papers
cond-mat.str-el2020
Perturbed Sachdev-Ye-Kitaev model: a polaron in the hyperbolic plane
A. V. Lunkin, A. Yu. Kitaev, M. V. Feigel'man
We study the SYK model with a weak SYK term of magnitude beyond the simplest perturbative limit considered previously. For intermediate values of the perturbation stren…
cond-mat.str-el2018
SYK model with quadratic perturbations: the route to a non-Fermi-liquid
A. V. Lunkin, K. S. Tikhonov, M. V. Feigel'man
We study the stability of the SYK model with a large but finite number of fermions with respect to a perturbation, quadratic in fermionic operators. We develop analytic per…