Rotons in Optical Excitation Spectra of Monolayer Semiconductors

26 Dec 2018 Cotlet Ovidiu Wild Dominik S. Lukin Mikhail D. Imamoglu Atac

Optically generated excitons dictate the absorption and emission spectrum of doped semiconductor transition metal dichalcogenide monolayers. We show that upon increasing the electron density, the elementary optical excitations develop a roton-like dispersion, evidenced by a shift of the lowest energy state to a finite momentum on the order of the Fermi momentum... (read more)

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  • MESOSCALE AND NANOSCALE PHYSICS
  • QUANTUM GASES