Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large g factor in bilayer WS$_2$ flakes   The valley of transition metal dichalcogenides provides an additional
platform to manipulate spin due to its unique selection rule. Normally,
intralayer optical transitions in magnetic field show a Zeeman splitting with g
factor of about $-4$. Here we report remarkable valley Zeeman effect exhibited
by splitting of excitonic emission in a bilayer WS$_{2}$, with a value of g
factor as large as $-16.5$. The observed large g factor results from the
interlayer recombination, as the conduction band and valence band are modified
in opposite directions by magnetic field in different layers. The interlayer
recombination is due to the defect induced inversion symmetry breaking, which
is theoretically not accessible in ideal bilayer WS$_{2}$ with inversion
symmetry. Large g factor of interlayer emission offers potential benefits for
future optical spin control and detection.

33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga