Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical Study of the Free Carrier Response of LaTiO3/SrTiO3
  Superlattices   We used infrared spectroscopic ellipsometry to investigate the electronic
properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that,
independent of the SL periodicity and individual layer-thickness, the SLs
exhibited a Drude metallic response with sheet carrier density per interface
~3x10^14 cm^-2. This is probably due to the leakage of d-electrons at
interfaces from the Mott insulator LaTiO3 to the band insulator SrTiO3. We
observed a carrier relaxation time ~ 35 fs and mobility ~ 35 cm^2V^-1s^-1 at 10
K, and an unusual temperature dependence of carrier density that was attributed
to the dielectric screening of quantum paraelectric SrTiO3.

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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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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: mtrl-th