BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Synthetic topological matter with ultracold dysprosium atom
DTSTART:20230324T141500
DTSTAMP:20260506T184529Z
UID:5323eb7f256b59921288f293560441a053016c85e8d976c5cec09bc7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Aurélien Fabre\n\nCollege de France\nTopological states o
 f matter lie at the heart of our modern understanding of condensed matter 
 systems. For example\, in two-dimensional quantum Hall insulators\, the no
 n-trivial topology\, defined by a topological invariant called the first C
 hern number in this context\, manifests as a quantised Hall conductance an
 d protected ballistic edge modes. Recently\, the concept of synthetic dime
 nsions has been experimentally exploited to engineer more exotic systems. 
 It relies on internal degrees of freedom to simulate an additional dimensi
 on\, which facilitates the realisation of artificial gauge fields for neut
 ral atoms.\nIn this talk\, I will present recent experimental works on int
 eger quantum Hall systems using ultracold samples of atomic dysprosium. We
  benefit from the large total angular momentum J=8 of dysprosium atoms in 
 their electronic ground state to simulate a synthetic dimension of 2J+1=17
  lattice sites. Using optical couplings of different ranges\, we encode tw
 o synthetic dimensions in a single spin\, which we exploit to realise two 
 systems: a quantum Hall cylinder and a four-dimensional quantum Hall syste
 m. I will focus on the quantum Hall cylinder and our realisation of Laughl
 in's topological charge pump. In a set of experiments\, we probe the trans
 verse Hall response and observe topological pumping of particles as we thr
 ead magnetic flux through the hole of the cylinder. Our measurements are i
 n agreement with the quantisation of the first Chern number of the ground 
 band.\nIn the last part\, I will present some preliminary results on the m
 easurement of the entanglement spectrum\, a probe of topological order ini
 tially conjectured by Li and Haldane\, in an integer quantum Hall system.\
 n 
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR