Speaker
Prof.
Stephanie M Reimann
(Lund University)
Description
Cold atom systems offer many possibilities to shape
mesoscopic quantum systems with properties that are
fundamentally different from semiconductor
nanostructures, such as quantum dots and quantum
wires with electrons. The talk will provide a review on
the many-body physics of these finite-size bosonic or
fermionic quantum systems, with focus on the
configuration interaction method. For bosonic systems,
the relation between finite-size systems and the
thermodynamic limit will be addressed [1]. For dipolar
interactions in low-dimensional systems, the Wigner
localization emerging with increasing coupling strength
of the dipoles exhibits nontrivial geometries due to the
anisotropy of the interaction [2]. In the regime of
weaker interactions, for fermions with aligned
dipole moments strong shell structure occurs, which is
strongly diminished by changing the dipolar tilt angle
[3]. The talk will also address the effect of Rashba-type
spin-orbit coupling in the few-body limit [4]. Inspired by
the recent experimental developments with atom
transport [5,6] we furthermore investigate the analog
of a quantum wire using ultra-cold particles, finding a
new scenario for the quantum transport [7]:
Attractive interactions may lead to a complete
suppression of current in the low-bias range, a total
current blockade. In particular, we consider this effect
for the example of ultra-cold quantum gases with dipolar
interactions.
[1] J. Cremon, G.M. Kavoulakis, B.R. Mottelson and S.M.
Reimann, submitted (2012).
[2] J.Cremon, G.M. Bruun and S.M. Reimann, Phys. Rev.
Lett. 105, 255301 (2010); S. Zöllner, G.M. Bruun, S.M.
Reimann and C.J. Pethick, Phys. Rev. Lett. 107, 035301
(2011).
[3] G. Eriksson, J. Cremon and S.M. Reimann, to be
published.
[4] A. Cavalli, F. Malet, J. Cremon and S.M. Reimann,
Phys. Rev. B 84, 235117 (2011); Y. Yusefi et al., to be
published.
[5] J.P. Brantut, J. Meineke, D. Stadler, S. Krinner, and
T. Esslinger, Science 337, 1069-1071 (2012)
[6] D. Stadler, S. Krinner, J. Meineke, J.P. Brantut,
and T. Esslinger, Nature 491, 736 (2012)
[7] L.H. Kristinsdottir, O. Karlström, J. Bjerlin, J.C.
Cremon, P. Schlagheck, A. Wacker, S.M. Reimann, to be
published.
Primary author
Prof.
Stephanie M Reimann
(Lund University)
