6533b7d5fe1ef96bd1264906

RESEARCH PRODUCT

Spin pumping and measurement of spin currents in optical superlattices

Michael LohseRoberta CitroImmanuel BlochChristian Schweizer

subject

PhysicsCondensed Matter::Quantum GasesSpin pumpingCondensed matter physicsSpin polarizationSuperlatticePhysics::OpticsGeneral Physics and AstronomyFOS: Physical sciencesCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciences010305 fluids & plasmasPhysics and Astronomy (all)Condensed Matter::Materials ScienceQuantum Gases (cond-mat.quant-gas)0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsPhysics::Atomic PhysicsCondensed Matter - Quantum Gases010306 general physicsSpin-½Boson

description

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.

yearjournalcountryeditionlanguage
2016-10-21
https://dx.doi.org/10.48550/arxiv.1608.08153