Matter-wave interferometry from electrons to nanoparticles - recent ideas and applications

Modern matter-wave experiments cover a broad mass range from single electrons to molecules consisting of hundreds of atoms. Levitated optomechanics promises to be-come a platform for matter waves of nanoparticles weighing a billion atomic mass units. Across this range, matter waves are being used and considered for precision metrology and tests of fundamental physics at the quantum-classical boundary. I will present three recently developed use cases: (1) harnessing the high interferometric phase sensitivity in state-of-the-art electron microscopes for magnetic spin sensing and resonance imaging with electron beams; (2) probing possible deviations from Newtonian gravity with atom interferometry; (3) diffracting a massive nanoparticle at its own crystal lattice with help of Bragg-scattered electrons.