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Strouhal's Lecture - Jana Kalbáčová Vejpravová: CURRENT CHALLENGES OF LOW-DIMENSIONAL MAGNETISM
Begin: 03.03.2021, 14:00
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Jakub Šebesta: Topological Insulators and Magnetic Order
Begin: 04.03.2021, 14:30
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Dominik Legut: Thermal expansion and thermal conductivity of novel nuclear fuels
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Milan Dopita: Instrumentation and experimental facilities of the X-ray laboratory at the DCMP, MFF UK
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Herwig Michor: Crystal Growth and Studies of Magnetism and Charge Density Wave Physics in Quasi-1D Metals RNiC2
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Title: Andrej Pustogow: Rise and Fall of Landau's Quasiparticles While Approaching the Mott Transition
Number: 7/21
Status: Not exceeded
Begin: Wednesday, 07.04. 2021, 14:10
Tutor: 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) http://mgml.eu.

 

Program

 

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

 

https://cesnet.zoom.us/j/95804267376
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

 

Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

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