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A researcher who contributed to the 2014 observation of Rydberg excitons in a semiconductor. Their large spatial extent strengthens interactions between excitations, making these states useful for studying collective optical behavior in a crystal rather than only the properties of isolated electron–electron hole pairs.^[ref]

Manfred Bayer coauthored the 2014 observation of Rydberg excitons in cuprous oxide. The electron-hole bound states reached principal quantum numbers up to 25, with spatial extents measured on micrometre scales. Their large size strengthens interactions between excitations, and the experiment found evidence that one excitation suppresses creation of another nearby. The result brings highly excited atomic-like states and collective optical effects into a solid.^[ref]

A Rydberg exciton is an excited bound electron-hole state with a large principal quantum number. Like a Rydberg atom, it can have a large spatial extent and strong sensitivity to external fields, but its energies and size are modified by the semiconductor's effective masses and dielectric response.

Experiments on cuprous oxide resolved high-lying excitonic states, allowing hydrogen-like series behavior to be studied in a solid. Deviations from a simple Coulomb model reveal crystal and band-structure effects.^[ref]

A researcher in quantum optics whose joint work on Rydberg excitons connects highly excited atomic states with optical excitations in semiconductors. The 2014 study found evidence of Rydberg blockade: the presence of one large exciton suppresses the creation of another nearby.^[ref]

A researcher in semiconductor optics whose team observed Rydberg excitons in cuprous oxide in 2014. These bound electron–electron hole pairs reached principal quantum numbers as high as 25 and extended over micrometers, allowing a crystal to host excitations resembling highly excited hydrogen atoms.^[ref]