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SUMMARY:Topological charge pumping with ultracold atomic gases - Prof Fabi
 an Heidrich-Meisner (University of Göttingen)
DTSTART:20230519T100000Z
DTEND:20230519T113000Z
UID:TALK201238@talks.cam.ac.uk
CONTACT:111806
DESCRIPTION:Clarifying the evolution of topological states of matter with 
 interactions is a core goal of condensed matter theory\, ranging from the 
 stability of topological insulators to the emergent regime of topological 
 quantum matter. Ultracold quantum gases in optical lattices provide unique
  opportunities to realize topological band-structures\, yet face challenge
 s concerning the loading of the bulk and the stability against heating in 
 the interacting case inherent to Floquet engineering scheme. Topological c
 harge pumps are conceptionally related to integer quantum Hall effects via
  dimensional reduction\, with a different physical manifestation via the q
 uantized charge. Their realization\, notably\, does not require fast drivi
 ng and relies on established experimental loading schemes and therefore\, 
 this system provides unique opportunities to investigate the effect of int
 eractions. \nI will report on three main results. First\, we investigated 
 the stability of charge pumping in the bosonic systems. Second\, we charac
 terized the breakdown of quantized pumping due to the addition of quenched
  disorder. Finally\, we turn to interacting fermions and show that interac
 tions can change the pumped charge per cycle from the value obtained for n
 oninteracting systems.\n[1] A. Hayward\, C. Schweizer\, M. Lohse\, M. Aide
 lsburger\, and F. Heidrich-Meisner Phys. Rev. B 98\, 245148 (2018) \n[2] A
 . L. C. Hayward\, E. Bertok\, U. Schneider\, and F. Heidrich-Meisner Phys.
  Rev. A 103\, 043310 (2021) \n[3] E. Bertok\, F. Heidrich-Meisner\, and A.
  A. Aligia Phys. Rev. B 106\, 045141 (2022)\n
LOCATION:Ryle Seminar Room (930) 
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