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arXiv:1906.09328 · Physical Review A

Bloch-band picture for light-pulse atom diffraction and interferometry

Daniel Gochnauer, Katherine E. McAlpine, Benjamin Plotkin-Swing, Alan O. Jamison, Subhadeep Gupta

Published Oct 21, 2019• 12 citations
arXivHTMLPDF

Abstract

An experimental validation of a Bloch-band picture for the analysis of Bragg diffraction in an atom interferometer with Bose-Einstein condensates is presented. Based on this picture, a method to determine atomic band structure in an optical lattice is demonstrated.
DOI
10.1103/physreva.100.043611

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We report on experiments investigating quantum transport and band interferometry of an atomic Bose-Einstein condensate in an optical lattice with a two-band miniband structure, realized with a Fourier-synthesized optical lattice potential. Bloch-Zener oscillations, the coherent superposition of Bloch oscillations and Landau-Zener tunneling between the two bands are observed. When the relative phase between paths in different bands is varied, an interference signal is observed, demonstrating the coherence of the dynamics in the miniband system. Measured fringe patterns of this Stückelberg interferometer allow to interferometrically map out the band structure of the optical lattice over the full Brillouin zone.