Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Valley polarization generated in 3-dimensional group-IV monochalcogenids   Valleytronics is one of the breaking-through to the technology of
electronics, which provides a new degree of freedom to manipulate the
properties of electrons. Combining DFT calculations, optical absorption
analysis and the linear polarization-resolved transmission measurement
together, we report that three pairs of valleys, which feature opposite optical
absorption, existing in the 3-dimensional (3D) group-IV monochalcogenids. By
applying the linearly-polarized light, valley polarization is successfully
generated for the first time in a 3D system, which opens a new direction for
the exploration of the valley materials and provides a good platform for the
photodetector and valleytronic devices. Valley modulation versus the in-plane
strain in GeSe is also studied, suggesting an effective way to get the
optimized valleytronic properties.

36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio