Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherence Control of Directional Nonlinear Photocurrent in Spatially
  Symmetric Systems   The interplay between crystal symmetry and its optical responses is at the
heart of tremendous recent advances in light-matter interactions and
applications. Nonlinear optical processes that produce electric currents, for
example bulk photovoltaic (BPV) effect, require inversion symmetry broken
materials, such as ferroelectrics. In the current work, we demonstrate that
such BPV current could be generated in centrosymmetric materials with
excitation of out-of-equilibrium coherent phonons. This is much different from
the generally studied static or thermally excited states. We show that
depending on the oscillating phase factor of the coherent phonon,
uni-directional static electric current can be observed, in addition to some
terahertz alternating currents. We also generalize the conventional injection
charge current into angular momentum (spin and orbital) degrees of freedom, and
demonstrate spin and orbital BPV photocurrents under coherent phonons. Our
findings open the pathway to exploring the exotic phonon-photon-electron
coherent interactions in quantum materials.

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The categories of this paper are: hep-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol