Optical characterization of electron-phonon interactions at the saddle point in graphene.
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The role of many-body interactions is experimentally and theoretically investigated near the saddle point absorption peak of graphene. The time and energy-resolved differential optical transmission measurements reveal the dominant role played by electron-acoustic phonon coupling in band structure renormalization. Using a Born approximation for electron-phonon coupling and experimental estimates of the dynamic lattice temperature, we compute the differential transmission line shape. Comparing the numerical and experimental line shapes, we deduce the effective acoustic deformation potential to be Deff(ac)≃5 eV. This value is in accord with recent theoretical predictions but differs from those extracted using electrical transport measurements.
Published Version (Please cite this version)10.1103/PhysRevLett.112.187401
Publication InfoRoberts, AT; Binder, R; Kwong, NH; Golla, D; Cormode, D; LeRoy, BJ; ... Sandhu, A (2014). Optical characterization of electron-phonon interactions at the saddle point in graphene. Phys Rev Lett, 112(18). pp. 187401. 10.1103/PhysRevLett.112.187401. Retrieved from http://hdl.handle.net/10161/13873.
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Adjunct Professor of Physics
Dr. Everitt is one of the Army's chief scientists. He works at the Army's Aviation and Missile RD&E Center at Redstone Arsenal, AL. Through his adjunct appointment in the Duke Physics Department, he leads an active experimental research group in condensed matter physics, nanophotonics, molecular physics, and novel terahertz imaging with colleagues on campus and through an international network of collaborators. Four principal research areas are being pursued: 1) Ultrafast Spectroscopy.