Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong energy-momentum dispersion of phonon-dressed carriers in the
  lightly doped band insulator SrTiO$_3$   Much progress has been made recently in the study of the effects of
electron-phonon (el-ph) coupling in doped insulators using angle resolved
photoemission (ARPES), yielding evidence for the dominant role of el-ph
interactions in underdoped cuprates. As these studies have been limited to
doped Mott insulators, the important question arises how this compares with
doped band insulators where similar el-ph couplings should be at work. The
archetypical case is the perovskite SrTiO$_3$ (STO), well known for its giant
dielectric constant of 10000 at low temperature, exceeding that of
La$_2$CuO$_4$ by a factor of 500. Based on this fact, it has been suggested
that doped STO should be the archetypical bipolaron superconductor. Here we
report an ARPES study from high-quality surfaces of lightly doped SrTiO$_3$.
Comparing to lightly doped Mott insulators, we find the signatures of only
moderate electron-phonon coupling: a dispersion anomaly associated with the low
frequency optical phonon with a $\lambda'\sim0.3$ and an overall bandwidth
renormalization suggesting an overall $\lambda'\sim0.7$ coming from the higher
frequency phonons. Further, we find no clear signatures of the large pseudogap
or small polaron phenomena. These findings demonstrate that a large dielectric
constant itself is not a good indicator of el-ph coupling and highlight the
unusually strong effects of the el-ph coupling in doped Mott insulators.

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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: gr-qc