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Colloquium: Critical and incoherent electron systems and superconductivity within the Sachdev-Ye-Kitaev approach

Datum
05.08.2019
Zeit
16:30 - 17:30
Sprecher
Prof. Jörg Schmalian
Zugehörigkeit
Institut für Theorie der Kondensierten Materie (TKM), Karlsruhe
Serie
MPI-PKS Kolloquium
Sprache
en
Hauptthema
Physik
Andere Themen
Physik
Beschreibung
The established and highly successful description of metals is based on Landau’s Fermi liquid theory. The relevant phase space for electron-electron collisions is determined by the Pauli blocking of a degenerate Fermi gas due to its Fermi surface. In some strongly correlated systems narrow bands form and the energetics of the system at elevated energies or temperatures becomes dominated by strong interactions and is no longer restricted by Fermi-surface phase-space effects. To develop a well-controlled approach of this regime is an important question in the theory of strongly correlated electrons.
In this talk I will give an overview over the description of incoherent and critical electronic systems using the Sachdev-Ye-Kitaev approach. We consider versions of the model where electrons interact with each other, with boson collective modes, and even with phonons. We also comment on the very direct relation to holographic approaches to strongly coupled quantum theories. Finally we address the emergence of superconductivity in such an incoherent metal and show that pairing and superconductivity of a fully incoherent electronic system is allowed and leads to a pairing state with high transition temperature but low condensation energy.

Letztmalig verändert: 21.07.2019, 22:06:15

Veranstaltungsort

Max-Planck-Institut für Physik komplexer SystemeNöthnitzer Straße3801187Dresden
Telefon
+ 49 (0)351 871 0
E-Mail
MPI-PKS
Homepage
http://www.mpipks-dresden.mpg.de

Veranstalter

Max-Planck-Institut für Physik komplexer SystemeNöthnitzer Straße3801187Dresden
Telefon
+ 49 (0)351 871 0
E-Mail
MPI-PKS
Homepage
http://www.mpipks-dresden.mpg.de
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