2019/02/28 by Martin Lebrat, Samuel Häusler, Philipp Fabritius +3 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.mes-hall #physics.atom-ph
paper · pdf · doi:10.1103/physrevlett.123.193605
published as Phys. Rev. Lett. 123, 193605 (2019) · see also companion paper arXiv:1907.06436
arxiv created 2019/07/16 · arxiv updated 2019/11/13
We implement a microscopic spin filter for cold fermionic atoms in a quantum point contact (QPC) and create fully spin-polarized currents while retaining conductance quantization. Key to our scheme is a near-resonant optical tweezer inducing a large effective Zeeman shift inside the QPC while its local character limits dissipation. We observe a renormalization of this shift due to interactions of a few atoms in the QPC. Our work represents the analog of an actual spintronic device and paves the way to studying the interplay between spin-splitting and interactions far from equilibrium.