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Charge structure of a quasiparticle in graphite measured with inelastic X-ray scattering

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Title: Charge structure of a quasiparticle in graphite measured with inelastic X-ray scattering
Author(s): Reed, James P.
Director of Research: Abbamonte, Peter M.
Doctoral Committee Chair(s): Chiang, Tai-Chang
Doctoral Committee Member(s): Abbamonte, Peter M.; Stone, Michael; Wiss, James
Department / Program: Physics
Discipline: Physics
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): quasiparticle inelastic x-ray scattering scattering x-ray fourier kramers kronig dielectric constant screening graphite graphene charge density loss function electron imaging anisotropy anisotropic charge structure charge structure conversion susceptibility density green's function density density proper susceptibility full susceptibility sum rule electron density
Abstract: The following work consists of three related topics. First, we demonstrate a multi-dimensional, attosecond-resolution, real-space electron density imaging technique. We apply the technique to the energy-loss spectra of graphite, which we measured using inelastic X-ray scattering at the Advanced Photon Source in Argonne, IL. The results are images of the anisotropic charge density cloud that surrounds a test charge to form quasiparticles in graphite. We are able to watch the anisotropic charge structure of a quasiparticle as it is born and evolves in real-space and at 10 attosecond intervals. We then set the dynamical part in motion to test how rigidly the quasiparticle maintains its structure with increasing velocity. Second, we perform numerical integration on the charge density data to obtain the size of the static background dielectric constant, "epsilon". We offer a possible explanation for some of the discrepancies between current experiments and theoretical work on graphene based on our findings from graphite. Lastly, we introduce a conversion technique as a work in-progress which enables us to examine the 2-dimensional density-density Green's function from 3-dimensional data.
Issue Date: 2010-01-06
URI: http://hdl.handle.net/2142/14611
Rights Information: Copyright 2009 James P. Reed
Date Available in IDEALS: 2010-01-06
Date Deposited: 2009-12
 

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