Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal Sublimation: a Scalable and Controllable Thinning Method for the
  Fabrication of Few-Layer Black Phosphorus   In this work, we reported uniform layer-by-layer sublimation of black
phosphorus under heating below 600 K. The uniformity and crystallinity of BP
samples after thermal thinning were confirmed by Raman spectra and 2D Raman
imaging. A uniform and crystalline bilayer black phosphorus flake with an area
of 180 um^2 was prepared with this method. No micron scale defects were
observed. The sublimation rate of BP was around 0.18 nm / min at 500 K and 1.5
nm / min at 550 K. Both room and high temperature Raman peak intensity ratio
Si/A2g vs. BP thickness relations were established for in-situ thickness
determination. The sublimation thinning method was shown to be a controllable
and scalable approach to prepare few-layer black phosphorus.

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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: econ