Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NMR Probe of Metallic States in Nanoscale Topological Insulators   A 125Te NMR study of bismuth telluride nanoparticles as function of particle
size revealed that the spin-lattice relaxation is enhanced below 33 nm,
accompanied by a transition of NMR spectra from single to bimodal regime. The
satellite peak features a negative Knight shift and higher relaxivity,
consistent with core polarization from p-band carriers. Whereas nanocrystals
follow a Korringa law in the range 140-420K, micrometer particles do so only
below 200K. The results reveal increased metallicity of these nanoscale
topological insulators in the limit of higher surface-to-volume ratios.

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The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc