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SUMMARY:MARVEL Distinguished Lecture - Stefano Baroni
DTSTART:20201117T150000
DTEND:20201117T161500
DTSTAMP:20260407T183943Z
UID:e1becda52f03ab3b78fc3933ad409e26f264c6a2f366cac197d77ae7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Stefano Baroni\, Scuola Internazionale Superiore di St
 udi Avanzati (SISSA)\, Trieste\, Italy\n \n   https://epfl.zoom.us/j/82
 989047900\n   Passcode: 3214 \n\nProf. Stefano Baroni\nProfessor of th
 eoretical condensed-matter physics at the Scuola Internazionale Superiore
  di Studi Avanzati (SISSA)\, Trieste\, Italy\n \nGauge invariance of heat
  and charge transport coefficients\nTransport coefficients have been recen
 tly shown to be largely independent of the microscopic representation of t
 he current density of the conserved quantity being transported (charge/mas
 s/energy) [1]. This remarkable gauge invariance has been leveraged to lay 
 down a rigorous density-functional theory of heat transport [1]\, as well 
 as a general approach to it in solids\, that nicely bridges the Boltzmann-
 Peierls kinetic model\, which applies to crystals\, and the Allen-Feldman 
 one\, which applies to glasses [2]. In the case of charge transport\, a co
 mbination of gauge invariance and Thouless’ quantisation of particle tra
 nsport [3] allows one to express the electrical conductivity of a stoichio
 metric ionic conductor in terms of integer-valued\, scalar\, and time-inde
 pendent atomic oxidation numbers\, instead of real-valued\, tensor\, and t
 ime-dependent Born charges [4]. The departure of non stoichiometric system
 s from this picture\, due to the existence of localised electron pairs\, c
 an be fathomed in terms of topological effects on charge transport [5]. In
  this talk I will review these concepts and report on some key application
 s of them to liquids and glasses.\n[1] A. Marcolongo\, P. Umari\, and S. B
 aroni\, Nat. Phys. 12\, 80 (2016)\;\n[2] L. Isaeva\, G. Barbalinardo\, D. 
 Donadio\, and S. Baroni\, Nat. Commun. 10\, 3853 (2019)\;\n[3] D.Thouless\
 , Phys. Rev. B\, 27\, 6083 (1983)\;\n[4] F. Grasselli and S. Baroni\, Nat.
  Phys. 15\, 967 (2019)\;\n[5] P. Pegolo\, F. Grasselli\, and S. Baroni\, P
 hys. Rev. X\, in press.\n \nAbout the speaker\nStefano Baroni received hi
 s Dottore in Fisica degree from the University of Pisa in 1978. He is cu
 rrently a full professor of theoretical condensed matter physics at SISSA 
 (Trieste\, Italy). Stefano Baroni has authored ≈ 220 scientific publica
 tions in peer reviewed scientific journals and conference proceedings\, ha
 ving gathered ≈ 32\,000/42\,000 citations (Web of Science/Google Scholar
 ) and earning him an H index of 56/64\, as of November 2020. His scientifi
 c interests are at the frontier between theory and simulation: he likes to
  invent methods to compute properties and simulate processes previously de
 emed inaccessible to scientific computation\, and to apply them to problem
 s that are scientifically and technologically important. He is largely cre
 dited for the introduction of density-functional perturbation theory (DFPT
 )\, a methodology that is considered the state of the art for the computat
 ion of lattice dynamical properties in solids\, including phonon frequenci
 es and lifetimes. He has pioneered O(N) methods in electronic-structure th
 eory and he has also introduced important innovations in quantum stochasti
 c simulations. Recently\, he has successfully extended DFPT so as to encom
 pass electronic excited states through time-dependent density-functional a
 nd many-body perturbation theories. He has thoroughly applied these method
 ological innovations to a number of problems in semiconductor physics\, th
 e chemical physics of metal surfaces\, and\, more recently\, molecular and
  magnetic spectroscopies. Over the past 5 years he has given important con
 tributions to the theory and numerical simulation of adiabatic heat and ch
 arge transport in liquid and disordered systems.\n \n \nMark your calend
 ars for other upcoming MARVEL Distinguished Lectures:\n\n	Prof. Silvia Pic
 ozzi\n	Director of Research at Consiglio Nazionale delle Ricerche (CNR) at
  the Institute for Superconducting and Innovative materials and Devices (S
 PIN) in Chieti\, Italy\n	Spin-orbit coupling: a small interaction leading 
 to rich physics\n	Tuesday\, December 15\, 2020\, 15:00 (CET)\n	 \n	Prof. 
 Jens K. Nørskov\n	Professor of physics at the Technical University of Den
 mark (DTU)\n	Catalysis for sustainable production of fuels and chemicals\n
 	Tuesday\, January 26\, 2021\, 15:00 (CET)\n
LOCATION:Zoom
STATUS:CONFIRMED
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