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Your search keyword '"Windpassinger, P."' showing total 2 results
Start Over Author "Windpassinger, P." Topic magnetic fields
2 results on '"Windpassinger, P."'

1. Tunable gauge potential for spinless particles in driven lattices.

Author

Simonet, J., Struck, J., Weinberg, M., Ölschläger, C., Hauke, P., Eckardt, A., Lewenstein, M., Sengstock, K., and Windpassinger, P.

Subjects
OPTICAL lattices, SUPERFLUIDITY, MAGNETIC fields, SYMMETRY (Physics), QUANTUM perturbations
Abstract

We present a universal method to create a tunable, artificial vector gauge potential for neutral particles trapped in an optical lattice. A suitable periodic shaking of the lattice allows to engineer a Peierls phase for the hopping parameters. This scheme thus allows one to address the atomic internal degrees of freedom independently. We experimentally demonstrate the realisation of such artificial potentials in a 1D lattice, which generate ground state superfluids at arbitrary non-zero quasimomentum [4]. This scheme offers fascinating possibilities to emulate synthetic magnetic fields in 2D lattices. In a triangular lattice, continuously tunable staggered fluxes are realised. Spontaneous symmetry breaking has recently been observed for a π-flux [23]. With the presented scheme, we are now able to study the influence of a small symmetry breaking perturbation. [ABSTRACT FROM AUTHOR]

Published
2013
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2. Engineering Ising-XY spin-models in a triangular lattice using tunable artificial gauge fields.

Author

Struck, J., Weinberg, M., Ölschläger, C., Windpassinger, P., Simonet, J., Sengstock, K., Höppner, R., Hauke, P., Eckardt, A., Lewenstein, M., and Mathey, L.

Subjects
GAUGE field theory, ELECTRON spin, OPTICAL lattices, MAGNETIC coupling, MAGNETIC fields, GROUND state (Quantum mechanics)
Abstract

Magnetism plays a key role in modern science and technology, but still many open questions arise from the interplay of magnetic many-body interactions. Deeper insight into complex magnetic behaviour and the nature of magnetic phase transitions can be obtained from, for example, model systems of coupled XY and Ising spins. Here, we report on the experimental realization of such a coupled system with ultracold atoms in triangular optical lattices. This is accomplished by imposing an artificial gauge field on the neutral atoms, which acts on them as a magnetic field does on charged particles. As a result, the atoms show persistent circular currents, the direction of which provides an Ising variable. On this, the tunable staggered gauge field, generated by a periodic driving of the lattice, acts as a longitudinal field. Further, the superfluid ground state presents strong analogies with the paradigm example of the fully frustrated XY model on a triangular lattice. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
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