Monolithic atom interferometry

Atom and, more recently, molecule interferometers are used in fundamental research and industrial applications. Most atom rely on gratings made from laser beams, which can provide high precision, but cannot reach very short wavelengths require complex systems to function. Contrary this, simple monolithic cut single crystals offer (sub) nanometer with an extreme level of stability robustness. Such devices were conceived demonstrated several decades ago for neutrons electrons. Here, we propose a design thermal-beam interferometer based (quantum) reflection. We show, as example, how reflective, (Mach-Zehnder type) be realized helium beam using $\mathrm{Si}(111)\text{\ensuremath{-}}\mathrm{H}(1\ifmmode\times\else\texttimes\fi{}1)$ surfaces, have previously been act robust stable diffractive mirrors neutral atoms.