Observation of Quantized Klein Tunneling in a Dielectric Resonator Chain

We present the first experimental observation of quantized Klein tunneling in a bounded Dirac system, implemented by a dimer chain of dielectric microwave resonators. Both the unusual quantized levels and corresponding spinor states hybridized from distinct particle and hole wavefunctions are measured. All observations are in quantitative agreement with the hitherto-untested prediction of Dirac equation. Our results make an important step to realize and understand the particle-hole physics of Klein tunneling in bounded Dirac systems, and also shed light on potential applications for manipulating particle-hole hybridized spinor waves.