Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous Quantum Transport Properties in Semimetallic Black Phosphorus   Magnetoresistance in single crystals of black phosphorus is studied at
ambient and hydrostatic pressures. In the semiconducting states at pressures
below 0.71 GPa, the magnetoresistance shows periodic oscillations, which can be
ascribed to the magneto-phonon resonance that is characteristic of high
mobility semiconductors. In the metallic state above 1.64 GPa, the both
transverse and longitudinal magnetoresistance show titanic increase with
exhibiting superposed Shubnikov-de Haas oscillations. The observed small Fermi
surfaces, high mobilities and light effective masses of carriers in
semimetallic black phosphorus are comparable to those in the representative
elemental semimetals of bismuth and graphite.

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The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: eess
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas