Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Ultra-Cold Atoms, Ions and BEC IV (with Q)

A 31.1: Fachvortrag

Donnerstag, 5. März 2009, 16:30–17:00, VMP 6 HS-C

Novel phases of spinor fermions in 1D optical lattices — •Karen Rodriguez, Arturo Argüelles, and Luis Santos — Leibniz Universität Hannover, Hannover, Deutschland

The Hubbard Hamiltonian model shows two different phases namely Mott insulator and superfluid. When internal degrees of freedom like spin is added to the system, new phases can appear. By means of numerical simulations using Matrix Product State algorithms combined with an effective Hamiltonian which allows up to one particle per site, we found that the ground state of the system inside the Mott region shows the presence of spin-Peierls ordering. Furthermore, we showed that adding a magnetic field, the quadratic Zeeman effect allows us to drive the spin ordering into a Neel state.