Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Quantum Gases: Fermions II
Q 52.6: Vortrag
Donnerstag, 9. März 2017, 15:45–16:00, P 204
Versatile detection scheme for topological Bloch-state defects — •Marlon Nuske1, Matthias Tarnowski2,3, Nick Fläschner2,3, Benno Rem2,3, Dominik Vogel2, Klaus Sengstock1,2,3, Ludwig Mathey1,2,3, and Christof Weitenberg2,3 — 1Zentrum für optische Quantentechnologien, Universität Hamburg, 22761 Hamburg, Germany — 2Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
The dynamics in solid state systems is not only governed by the band structure but also by topological defects of the Eigenstates. A paradigmatic example are the Dirac points in graphene. For this system with a two-atomic basis the linear dispersion relation at the Dirac points is accompanied by a vortex of the azimuthal phase of the Eigenstates. In a time-of-flight (ToF) expansion the Eigenstates interfere and the resulting signal contains information about the azimuthal phase. We present a versatile detection scheme that uses off-resonant lattice modulation to extract the azimuthal phase from the ToF signal. This detection scheme is applicable to a variety of two-band systems and can be extended to general multi-band systems.