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We present a detailed optical study of single crystal bismuth using infraredreflectivity and ellipsometry. Colossal changes in the plasmon frequency areobserved as a function of temperature due to charge transfer between hole andelectron Fermi pockets. In the optical conductivity, an anomalous temperaturedependent mid-infrared absorption feature is observed. An extended Drude modelanalysis reveals that it can be connected to a sharp upturn in the scatteringrate, the frequency of which exactly tracks the temperature dependent plasmonfrequency. We interpret this absorption and increased scattering as the firstdirect optical evidence for a charge carrier interaction with a collective modeof purely electronic origin; here electron-plasmon scattering. The observationof a \emph{plasmaron} as such is made possible only by the unique coincidenceof various energy scales and exceptional properties of semi-metal bismuth.Comment: 4 pages, 4 figure

Charge Carrier Interaction with a Purely Electronic Collective Mode: Plasmarons and the Infrared Response of Elemental Bismuth