Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signatures of nonlinear magnetoelectricity in second harmonic spectra of
  SU(2) symmetry broken quantum many-body systems   Quantum mechanical perturbative expressions for second order dynamical
magnetoelectric (ME) susceptibilities have been derived and calculated for a
small molecular system using the Hubbard Hamiltonian with SU(2) symmetry
breaking in the form of spin-orbit coupling (SOC) or spin-phonon coupling.
These susceptibilities will have signatures in second harmonic generation
spectra. We show that SU(2) symmetry breaking is the key to generate these
susceptibilities. We have calculated these ME coefficients by solving the
Hamiltonian for low lying excited states using Lanczos method. Varying the
Hubbard term along with SOC strength, we find spin and charge and both
spin-charge dominated spectra of dynamical ME coefficients. We have shown that
intensities of the peaks in the spectra are highest when the magnitudes of
Hubbard term and SOC coupling term are in similar range.

1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga