Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-harmonic generation from few layer hexagonal boron nitride:
  evolution from the monolayer to the bulk response   Two-dimensional materials offer a versatile platform to study high-harmonic
generation (HHG), encompassing as limiting cases bulk-like and atomic-like
harmonic generation [Tancogne-Dejean and Rubio, Science Advance \textbf{4},
eaao5207 (2018)]. Understanding the high-harmonic response of few-layer
semiconducting systems is important, and might open up possible technological
applications. Using extensive first-principle calculations within a
time-dependent density functional theory framework, we show how the in-plane
and out-of-plane nonlinear non-perturbative response of two-dimensional
materials evolve from the monolayer to the bulk. We illustrate this phenomenon
for the case of multilayer hexagonal BN layered systems. Whereas the in-plane
HHG is found not to be strongly altered by the stacking of the layers, we found
that the out-of-plane response is strongly affected by the number of layers
considered. This is explained by the interplay between the induced electric
field by electron-electron interactions and the interlayer delocalization of
the wave-functions contributing most to the HHG signal. The gliding of a
bilayer is also found to affect the high-harmonic emission. Our results will
have important ramifications for the experimental study of monolayer and
few-layer two-dimensional materials beyond the case of hexagonal BN studied
here as the result we found arew generic and applicable to all 2D
semiconducting multilayer systems.

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The categories of this paper are: supr-con
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an