LENSS‐QSTAR Seeminar
4 at 11:00, Aula
A
Querzo
oli (LENS)
Februaary 21, 2014
Pierfraancesco Buonsante
QSSTAR & INO‐‐CNR
Inteeracting Bossons in a Diisordered La
attice:
D
Dynamical C
Characteriza
ation of the Quantum Phase
P
Diagrram
m systems is the subjectt of active theoretical The inteerplay of dissorder and iinteraction in quantum
and exp
perimental iinvestigation. While disorder tend
ds to localizze the particcles, interacctions can either ssuppress orr favor locaalization, thus stronglyy affecting the t single particle p
piccture. This competition is mirrrored in the rich phase diagram of the system,, featuring ssuperfluid and insulatin
ng (Bose‐glaass and Mo
ott) phases. Less is kno
own about the dynam
mical properrties of an interactting disordered system. Stimulatted by recent experimeents with ultra cold gasses, we stud
dy the supeerfluid flow of Bosons through
h a disordereed three‐dim
mensional lattice. Baseed on a Gutzzwiller apprroach, we id
dentify the ranges o
of interactio
on and disorrder strengtths where the superfluid current iss stable. Wee find that the region of dynam
mical instab
bility exhibits a remarkaable overlap
p with the Bo
ose‐glass ph
hase. Contactt: [email protected]