Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical generation and detection of pure valley current in monolayer
  transition metal dichalcogenides   We propose a practical scheme to generate a pure valley current in monolayer
transition metal dichalcogenides by one-photon absorption of linearly polarized
light. We show that the pure valley current can be detected by either
photoluminescence measurements or the ultrafast pump-probe technique. Our
method, together with the previously demonstrated generation of valley
polarization, opens up the exciting possibility of ultrafast optical-only
manipulation of the valley index. The tilted field effect on the valley current
in experiment is also discussed.

5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
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The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga