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Electron optics in the solid state promises new functionality in electronicsthrough the possibility of realizing micrometer-sized interferometers, lenses,collimators and beam splitters that manipulate electrons instead of light.Until now, however, such functionality has been demonstrated exclusively inone-dimensional devices, such as in nanotubes, and in graphene-based devicesoperating with p-n junctions. In this work, we describe a novel mechanism forrealizing electron optics in two dimensions. By studying a two-dimensionalFabry-P\'{e}rot interferometer based on a resonant cavity formed in anInAs/GaSb double quantum well using p-n junctions, we establish thatelectron-hole hybridization in band-inverted systems can facilitate coherentinterference. With this discovery, we expand the field of electron optics toencompass materials that exhibit band inversion and hybridization, with thepromise to surpass the performance of current state-of-the-art devices.

Electron-Hole Interference in an Inverted-Band Semiconductor Bilayer