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Dr. Lih-King Lim

Laboratoire Charles Fabry Institut d'Optique, Palaiseau, France

Friday, December 7th, 2012 at 11:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 03:20:30 PM on Thursday, November 29th, 2012

Bloch-Zener oscillations across a merging transition of Dirac points

A new model system to study Dirac points thanks to Cold atoms in a tunable hexagonal optical lattice.

Cold atoms loaded in a tunable hexagonal optical lattice provide a new model system to study Dirac points. By tuning the lattice parameters, Dirac points in the energy band structure can be manipulated by moving them and eventually, bringing them to a merging transition. The latter realizes a Lifshitz transition from a gapless phase with Dirac points to a gapped phase. To study such a system, Bloch-oscillation-type experiment has been performed with non-interacting fermionic atoms [10.1038/nature10871].

Here, we provide a quantitative description of the experiment within the framework of a universal Hamiltonian for the merging transition (see i.e 10.1140/epjb/e2009-00383-0 and 10.1103/PhysRevLett.108.175303). Moreover, we study signatures for the the corresponding atomic Stückelberg interferometry.

For further informations, please contact Dr. Luca Pezze.