Spin pumping and measurement of spin currents in optical superlattices

Abstract

We report on the experimental implementation of a spin pump with ultracold bosonic atoms in an optical superlattice. In the limit of isolated double wells it represents a 1D dynamical version of the quantum spin Hall effect. Starting from an antiferromagnetically ordered spin chain, we periodically vary the underlying spin-dependent Hamiltonian and observe a spin current without charge transport. We demonstrate a novel detection method to measure spin currents in optical lattices via superexchange oscillations emerging after a projection onto static double wells. Furthermore, we directly verify spin transport through in-situ measurements of the spins' center of mass displacement.

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• Dissipationless Quantum Spin Current at Room Temperature
• Time Reversal Polarization and a Z_2 Adiabatic Spin Pump
• Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
• Controlled exchange interaction between pairs of neutral atoms in an optical lattice
• Coherent collisional spin dynamics in optical lattices
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