Spin pumping and measurement of spin currents in optical superlattices
Quantum Gases
2016-10-26 v1
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.
Keywords
Cite
@article{arxiv.1608.08153,
title = {Spin pumping and measurement of spin currents in optical superlattices},
author = {Christian Schweizer and Michael Lohse and Roberta Citro and Immanuel Bloch},
journal= {arXiv preprint arXiv:1608.08153},
year = {2016}
}