Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantum Gases: Fermions

Q 51.2: Talk

Thursday, March 11, 2010, 14:15–14:30, E 001

Quantum solitons of spin-3/2 fermions in 1D optical lattices — •Arturo Argüelles and Luis Santos — Institut für Theoretische Physik, Leibniz Universität Hannover, Hannover, Deutschland

In this presentation we analyze the dynamics of spin-3/2 fermions in optical lattices, and in particular how this dynamics is affected by the quadratic Zeeman effect for different interaction regimes. In particular we shall present recent results on Matrix-Product-States simulations of the dynamics of hard-core spinor fermions. After briefly commenting on the possibility to have different spin-wave velocities, we shall discuss in detail the creation under proper conditions of quantum solitons. These quantum solitons are dimers at neighboring sites, which propagate without unbinding. The binding of the pair (which resembles a Peierls-Nabarro barrier) is induced by the interplay between quadratic Zeeman effect and spin-changing collisions. After discussing the existence and lifetime of these quantum solitons, we shall comment on soliton-soliton collisions, howing that the typical time for inelastic collisions (that destroy one of the two colliding solitons) is equal or larger than the soliton life-time, showing that the system can hold a meta-stable quantum-soliton gas.