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SUMMARY:Synthetic topological matter with ultracold dysprosium atom
DTSTART;VALUE=DATE-TIME:20230324T141500
DTSTAMP;VALUE=DATE-TIME:20240815T143316Z
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
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