Speaker
Prof.
Luis Santos
(Leibniz Universität Hannover)
Description
Atoms in optical lattices present exciting possibilities of
control and quantum engineering. In this talk I would
like to discuss two different scenarios which may be
attained within the current state of the art. I will first
discuss the case of bosons in zig-zag optical
lattices [1], which may be created using superlattice
techniques. For the case of unconstrained bosons I will
discuss in particular chiral phases and the possibility of
observing Mott-phases at vanishingly low interactions. I
will also discuss the case of bosons with a two-body
hard-core constraint, which becomes possible for large
three-body losses. I will show that in that case the
system presents a rich phase diagram, which includes
Haldane-insulator, pair-superfluid, density-wave and
chiral-superfluid phases. In the second part of the
talk I will discuss atoms in optical lattices with
periodically-modulated interactions. This periodic
modulation results in an effective nonlinear hopping
which leads to interesting phases, including pair-
superfluids, defect-free Mott insulators, and holon-
and doublon-superfluids [2].
[1] S. Greschner, L. Santos and T. Vekua,
arXiv:1202.5386
[2] A. Rapp, X. Deng and L. Santos, Phys. Rev. Lett.
109, 203005 (2012).
Primary author
Prof.
Luis Santos
(Leibniz Universität Hannover)
