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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20210329T140000
DTEND;TZID=Europe/Paris:20210329T160000
DTSTAMP:20210329T120000
UID:MEC-e2c0be24560d78c5e599c2a9c9d0bbd2@lps.u-psud.fr
CREATED:20210329
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SUMMARY:Kamran Behnia “The Nernst response of mobile superconducting vortices”
DESCRIPTION:\nKamran Behnia, ESPCI Paris\n\n\nAny solid hosting mobile charge carriers will produce an electric field in presence of a thermal gradient. This is a consequence of the combined conservation of energy and particle number. The Nernst effect refers to the off-diagonal component of this thermoelectric response emerging in presence of a finite magnetic field. At the beginning of the present century, it was generally assumed that the quasi-particle contribution to the Nernst signal is negligible and a BCS superconductor cannot produce a Nernst signal far above its critical temperature. These assumptions were contradicted by subsequent experiments, which showed that the transverse thermoelectric response quantifies the amount of entropy bound to a mobile carrier of magnetic flux [1]. A recent surprise [2] is that the entropy carried by a mobile superconducting vortex is much smaller than what it stocks in its core. Available experimental data point to the universality of the mobile sheet entropy of a magnetic flux line across different superconductors with vastly different critical temperatures. This may be due to an information barrier surrounding the topological singularity of vortices in fermionic superfluids [3].1. K. Behnia & H. Aubin, Rep. Prog. Phys. 79 (2016) 0465022. C. W. Rischau et al., Phys. Rev. Lett. 126, 077001 (2021)3. G. E. Volovik, The Universe in a Helium Droplet, Oxford (2003)\n\n
URL:https://www.lps.u-psud.fr/events/the-nernst-response-of-mobile-superconducting-vortices-kamran-behnia/
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
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