Observation of vortex nucleation in a rotating two-dimensional lattice of Bose-Einstein condensates - Condensed Matter > Quantum GasesReportar como inadecuado




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Abstract: We report the observation of vortex nucleation in a rotating optical lattice.A 87Rb Bose-Einstein condensate was loaded into a static two-dimensionallattice and the rotation frequency of the lattice was then increased from zero.We studied how vortex nucleation depended on optical lattice depth and rotationfrequency. For deep lattices above the chemical potential of the condensate weobserved a linear dependence of the number of vortices created with therotation frequency,even below the thermodynamic critical frequency required forvortex nucleation. At these lattice depths the system formed an array ofJosephson-coupled condensates. The effective magnetic field produced byrotation introduced characteristic relative phases between neighbouringcondensates, such that vortices were observed upon ramping down the latticedepth and recombining the condensates.



Autor: R. A. Williams, S. Al-Assam, C. J. Foot

Fuente: https://arxiv.org/



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