Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Cold Atomic Gases

TT 37.4: Vortrag

Dienstag, 1. April 2014, 10:30–10:45, HSZ 304

Spin-Imbalanced Fillings for Fermions in a Trap — •Denis Morath, Stefan Söffing, and Sebastian Eggert — TU Kaiserslautern, 67663 Kaiserslautern, Germany

Recently it has become experimentally feasible to realize tunable few-fermion systems in an ultra cold gas setup. Besides the huge variability in interaction using the Feshbach Resonance people are now able to control the filling of different pseudo-spin species independently. This leads to interesting local magnetizations i.e. spin resolved local densities. We calculate these quantities on a discretized, one dimensional system using a Quantum Monte Carlo algorithm called Stochastic Series Expansion. This offers the opportunity to perform complete quantum many-body simulations in order to study the influence of finite interactions, filling and temperature on the density-distribution. We observe the formation of an anti-ferromagnetic arrangement, but this is only stable for small and intermediate interactions and small spin imbalances. For higher interactions a Wigner crystal forms, which has regular peaks in the density, that are independent of spin. Hence the density of one spin species typically has more peaks in the particle density than the actual number of particles in this case.