  Halide perovskites are promising materials with many significant applications
in photovoltaics and optoelectronics. In this paper, we use integral methods to
quantify the resonant properties of halide perovskite nano-particles. We prove
that, for arbitrarily small particles, the subwavelength resonant frequencies
can be expressed in terms of the eigenvalues of the Newtonian potential
associated with its shape. We also characterize the hybridized subwavelength
resonant frequencies of a dimer of two halide perovskite particles. Finally, we
examine the specific case of spherical resonators and demonstrate that our new
results are consistent with previous works.
