Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Femtosecond currents in transition metal dichalcogenides monolayers   We theoretically study the interaction of an ultrafast intense linearly
polarized optical pulse with monolayers of transition metal dichalcogenides
(TMDCs). Such a strong pulse redistributes electrons between the bands and
generates femtosecond currents during the pulse. Due to the large bandwidth of
the incident pulse, this process is completely off-resonant. While in TMDCs the
time-reversal symmetry is conserved, the inversion symmetry is broken and these
monolayers have the axial symmetry along armchair direction but not along the
zigzag one. Therefore, the pulse polarized along the asymmetric direction of
TMDC monolayer generates both longitudinal, i.e., along the direction of
polarization, and transverse, i.e., in the perpendicular direction, currents.
Such currents result in charge transfer through the system. We study different
TMDC materials and show how the femtosecond transport in TMDC monolayers depend
on their parameters, such as lattice constant and bandgap.

34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th