Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Hall states observed in thin films of Dirac semimetal Cd3As2   A well known semiconductor Cd3As2 has reentered the spotlight due to its
unique electronic structure and quantum transport phenomena as a topological
Dirac semimetal. For elucidating and controlling its topological quantum state,
high-quality Cd3As2 thin films have been highly desired. Here we report the
development of an elaborate growth technique of high-crystallinity and
high-mobility Cd3As2 films with controlled thicknesses and the observation of
quantum Hall effect dependent on the film thickness. With decreasing the film
thickness to 10 nm, the quantum Hall states exhibit variations such as a change
in the spin degeneracy reflecting the Dirac dispersion with a large Fermi
velocity. Details of the electronic structure including subband splitting and
gap opening are identified from the quantum transport depending on the
confinement thickness, suggesting the presence of a two-dimensional topological
insulating phase. The demonstration of quantum Hall states in our high-quality
Cd3As2 films paves a road to study quantum transport and device application in
topological Dirac semimetal and its derivative phases.

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The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs