Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Quantum Gases: Fermions II
Q 52.4: Vortrag
Donnerstag, 9. März 2017, 15:15–15:30, P 204
Signatures of topological phases in ultracold fermionic ladders — •Andreas Haller1, Leonardo Mazza2, Matteo Rizzi1, and Michele Burrello3 — 1Institute of Physics, Johannes Gutenberg University, 55099 Mainz, Germany — 2Département de Physique, Ecole Normale Supérieur, 75005 Paris, France — 3Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
Inspired by the recent experimental advances in the study of ultracold atoms trapped in optical lattices, we consider models of ultracold fermions hopping in ladder geometries and subject to artificial magnetic fluxes.
In the presence and absence of interactions, we investigate the thermodynamic phases that can emerge in these simple, quasi-one-dimensional setups.
By applying the concept of resonances in chiral currents, we find a topological order parameter, distinguishing between trivial and quantum Hall (QH) phases.
We aim for evidence about fractional QH phases in ladders with short-range repulsive interactions: For both nearest and next-to-nearest neighbor interactions, tensor network simulations show not only the appearance of the expected ν = 1/3 Laughlin-like states, but also of an exotic ν=1/2 phase.