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UID:DSC-20795
DTSTART;TZID=Europe/Berlin:20240423T145000
SEQUENCE:1713850794
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20240423T162000
URL:https://dresden-science-calendar.org/calendar/en/detail/20795
LOCATION:TUD\,    
SUMMARY:Physics Colloquium / Prof. Päivi Törmä: Quantum geometry in flat
  band superconductivity\, Bose-Einstein condensation and light-matter inte
 ractions
CLASS:PUBLIC
DESCRIPTION:Speaker: \nInstitute of Speaker: \nTopics:\nWillkommen\n Locati
 on:\n  Name: TUD ()\n  Street:   \n  City:  \n  Phone: \n  Fax: \nDescript
 ion: <p>Event announcement as pdf-Download (https://tu-dresden.de/mn/phys
 ik/ressourcen/dateien/physikalisches-kolloquium/2024-04-23-Phys_Kolloq-Toe
 rmae-SoSe2024.pdf).</p>  <p><strong>Abstract</strong>: We have found that
  superconductivity and superfluidity have a connection to quantum geometry
 . Namely\, the superfluid weight in a multiband system has a previously un
 noticed component which we call the geometric contribution. It is proporti
 onal to the minimal quantum metric of the band. Quantum metric is connecte
 d to the Berry curvature\, and this allows to relate superconductivity wit
 h the topological properties of the band. Using this theory\, we have show
 n that superconductivity is possible also in a flat band where individual 
 electrons would not move. We and other groups have shown that these result
 s may be essential in explaining the observation of superconductivity in t
 wisted bilayer graphene and may eventually help realize superconductors at
  elevated temperatures. In addition to the promise of high critical temper
 atures and strong correlation effects\, also the quantum transport in flat
  band shows unique behavior: while supercurrent can flow\, quasiparticle t
 ransport is highly suppressed even in non-equilibrium conditions. This may
  have important consequences for superconducting devices. We have found th
 at quantum geometry also governs Bose- Einstein condensates in flat bands 
 and light-matter interactions. We have also experimentally observed the qu
 antum metric and non-Hermitian Berry curvature in plasmonic lattices.</p> 
  <p><strong>Short bio</strong>: Päivi Törmä is a professor at the D
 epartment of Applied Physics\, Aalto University\, Finland. Her research ra
 nges from theoretical quantum many-body physics to experiments in nanophot
 onics. Her theory work has revealed a new connection between quantum geome
 try and superconductivity that explains why flat bands can carry supercurr
 ent. In her experiments\, Törmä has worked on strong coupling of surfa
 ce plasmon polariton modes and molecules\, and her group has realized las
 ing and Bose-Einstein condensation phenomena in plasmonic nanoparticle arr
 ays. Törmä has a PhD from the University of Helsinki. She obtained the
  EURYI award in 2005\, the ERC Advanced Grant in 2013\, and the Academy Pr
 ofessorship of the Academy of Finland in 2017. She led the Nanoscience Cen
 tre of University of Jyväskylä 2002-2005 and the Finnish Centre of Exc
 ellence in Computational Nanoscience 2014-2017 and was a guest professor a
 t ETH Zürich in 2015. In 2021\, Törmä was elected as a member of the
  Academia Europaea.</p>
DTSTAMP:20260423T193031Z
CREATED:20240413T054012Z
LAST-MODIFIED:20240423T053954Z
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