Title: Andrej Pustogow: Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition
Number: 7/21
Status: Closing date exceeded
Begin: Wednesday, 07.04. 2021, 14:10
Tutor: Ross H. Colman & Vladimír Sechovský
Location: ZOOM Meeting ID: 958 0426 7376

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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML)




Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition

lecture given by:

Andrej Pustogow

Institute of Solid State Physics, TU Wien, Austria
Meeting ID: 958 0426 7376 

on Wednesday, 7.4. 2021 from 14:10 CEST (12.10 UTC) 

Passcode will be provided on request at  This e-mail address is being protected from spambots. You need JavaScript enabled to view it


Ross H. Colman & Vladimír Sechovský
On behalf of the DCMP and MGML


Landau suggested that the low-temperature properties of metals can be understood in terms of long-lived quasiparticles with all complex interactions included in Fermi-liquid parameters, such as the effective mass m*. Despite its wide applicability, electronic transport in bad or strange metals and unconventional superconductors is controversially discussed towards a possible collapse of the quasiparticle concept. Crucial information on this issue can be obtained by frequency-resolved probes that measure the complex optical conductivity [1].
Here we explore the electrodynamic response of correlated metals at half filling for varying correlation strength upon approaching a Mott insulator [2,3]. We reveal persistent Fermi-liquid behavior with pronounced quadratic dependences of the optical scattering rate on temperature and frequency, along with a puzzling elastic contribution to relaxation [4]. The strong increase of the resistivity beyond the Ioffe-Regel-Mott limit is accompanied by a `displaced Drude peak' in the optical conductivity. Our results, supported by a theoretical model for the optical response, demonstrate the emergence of a bad metal from resilient quasiparticles that are subject to dynamical localization and dissolve near the Mott transition [4].
[1] Rev. Mod. Phys. 83, 471 (2011)
[2] Nat. Mater. 17, 773-777 (2018)
[3] npj Quantum Mater. 6, 9 (2021); arXiv:1911.06766
[4] accepted at Nat. Commun. (2021), arXiv:2101.07201