Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum mechanical analysis of nonlinear optical response of interacting
  graphene nanoflakes   We propose a distant-neighbor quantum-mechanical (DNQM) approach to study the
linear and nonlinear optical properties of graphene nanoflakes (GNFs). In
contrast to the widely used tight-binding description of the electronic states
that considers only the nearest-neighbor coupling between the atoms, our
approach is more accurate and general, as it captures the electron-core
interactions between all atoms in the structure. Therefore, as we demonstrate,
the DNQM approach enables the investigation of the optical coupling between two
closely separated, but chemically unbound GNFs. We also find that the optical
response of GNFs depends crucially on their shape, size, and symmetry
properties. Specifically, increasing the size of nanoflakes is found to shift
their accommodated quantum plasmon oscillations to lower frequency.
Importantly, we show that by embedding a cavity into GNFs, one can change their
symmetry properties, tune their optical properties, or enable otherwise
forbidden second-harmonic generation processes.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat