Low-Energy Polaron Spectra in the Doped Fröhlich Model
ORAL
Abstract
Fröhlich solid as a model system for electron-phonon coupling in doped polar
semiconductors. Substantial improvements in the resolution of photoemission
spectroscopy have given access to the low-energy physics in these
systems, and have shown that electron-phonon interactions are at the core of a
wide range of intriguing properties, from high electron mobility to superconductivity.
In view of these advances, a sound theoretical description of energy levels and
effective masses in the doped Fröhlich solid is called for. In our study, we present
analytical results for the momentum-resolved spectral function as obtained from the
interacting electron Green’s function. We employ both the first-order
Migdal approximation and the higher-order Cumulant Expansion approach.
We find that the treatment of polaron satellites using the Cumulant Expansion achieves
much better agreement with experiment, albeit at the price of a poorer description of
quasiparticle dispersion relations.
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Presenters
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Nikolaus Kandolf
ODEN Institute for Computational Engineering and Sciences, University of Texas at Austin
Authors
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Nikolaus Kandolf
ODEN Institute for Computational Engineering and Sciences, University of Texas at Austin
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Carla Verdi
University of Vienna, Univ of Vienna, Department of Materials, University of Oxford
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Feliciano Giustino
Physics, University of Texas at Austin, University of Texas at Austin, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Department of Physic, The University of Texas at Austin, Austin, Texas 78712, USA, Oden Institute for Computational Engineering and Sciences, Oden Institute, University of Texas at Austin, Department of Materials, University of Oxford, Department of Physics, University of Texas at Austin, ODEN Institute for Computational Engineering and Sciences, University of Texas at Austin