Phonon Magnetochiral Effect of Band-Geometric Origin in Weyl Semimetals
Sanghita Sengupta
Département de physique
Université de Montréal
Présentation en anglais
Lien Zoom: https://umontreal.zoom.us/j/93026432919
Meeting ID: 930 2643 2919
Passcode: écrire en chiffre: un, trois, sept.
Abstract: The phonon magnetochiral effect consists of a nonreciprocity in the velocity or attenuation of acoustic waves when they propagate parallel and antiparallel to an external magnetic field. The first experimental observation of this effect in the bulk has been reported recently in a chiral magnet and ascribed to the hybridization between acoustic phonons and chiral magnons. Here, we predict a potentially measurable phonon magnetochiral effect of electronic origin in chiral Weyl semimetals. Caused by the Berry curvature and the orbital magnetic moment, this effect is enhanced for longitudinal phonons by the chiral anomaly.
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Intuitions on analytic continuation: kernels, condition numbers, and temperature invariance
Simon Verret
Département de physique
Université de Montréal
Présentation en anglais
Lien Zoom: https://umontreal.zoom.us/j/93026432919
Meeting ID: 930 2643 2919
Passcode: écrire en chiffre: un, trois, sept.
Abstract: This presentation will (re)introduce the analytic continuation problem by discussing elementary tools for characterizing and solving ill-conditioned inverse problems, namely the condition number and the Moore-Penrose pseudo-inverse. I will then present recent work that allowed to train neural networks to perform analytic continuation of transport functions at any temperature.
Cette conférence est présentée par le RQMP.
