Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.20: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Quench dynamics of ultracold fermions in hexagonal lattices — •Nick Fläschner, Dominik Vogel, Matthias Tarnowski, Benno Rem, Christof Weitenberg, and Klaus Sengstock — Institut für Laserphysik, Universität Hamburg

Ultracold fermions are ideally suited to test solid-state theories since many system parameters can be easily tuned. It is, however, often difficult to adiabatically prepare the respective ground state, which can, e.g., be due to technical lifetime limitations or when band gaps close at the phase transition point. Even if the ground state can be experimentally reached, it is often challenging to find suitable observables for characterizing the Hamiltonian. Addressing both of these limitations, we start in a spin-polarized fermionic band-insulator, perform a quench of various lattice parameters and observe the following dynamics in momentum space. This allows for a full reconstruction of the Hamiltonian of the quenched system in a momentum-resolved fashion, paving the way towards the experimental investigation of yet inaccessible ground states, also in the presence of interactions.