Titel | Referent | Datum | Ort |
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Gemeinsames TKM-TFP Seminar | Garst, Mirlin, Rockstuhl, Schmalian, Shnirman |
Montag, 14.00-15.30 Uhr |
10-01 |
TFP Institutsseminar | Garst, Rockstuhl |
Dienstag, 13.00-14.00 Uhr |
10-01 |
IQMT Seminar | Campus Nord, Geb. 425 |
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Physikalisches Kolloquium | Freitag, 15.45-17.15 Uhr |
Lehmann HS |
Seminar über Theoretische Festkörperphysik |
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Vortragender: | Alexey Lunkin |
Datum: | 16.07.2018 14:00 |
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Ort: | Room 10.01, 10th Floor, Bldg. 30.23, KIT Campus South |
Zugehörigkeit: | Landau Institute for Theoretical Physics, Russia |
Gastgeber: | Konstantin Tikhonov |
Abstract
We study stability of the SYK_4 model with a large but finite number of fermions N with respect to a perturbation, quadratic in fermionic operators. We develop analytic perturbation theory in the amplitude of the perturbation and demonstrate stability of the SYK_4 infra-red asymptotic behavior characterized by a Green function G(t) ~ t^(-3/2), with respect to weak quadratic perturbation. This result is supported by numerical exact diagonalization and solution of the mean-field equations. Our results open the way to build a theory of non-Fermi-liquid states of strongly interacting fermions.