Series expansion for the Fourier transform of a rational function in three dimensions

Abstract

In Rashba-Dresselhaus spin-orbit coupled systems, the calculation of Green's function requires the knowledge of the inverse Fourier transform of rational function $P(p)/Q(p)$, where $P(p)$ takes the values $1$ and $p^2$, and where \[ Q(p)=(p^{2}-ζ)^{2}- α^{2}(p_{1}^{2}+p_{2}^{2})-β^{2} \] with suitable parameters $\alpha$, $\beta \ge 0$, $\zeta \in \mathbb{C}$. While a two-dimensional problem, with $p=(p_1,p_2)$, has been recently solved [J. Brüning et al, J. Phys. A: Math. Theor. 40 (2007)], its three-dimensional analogue, with $p=(p_1,p_2,p_3)$, remains open. In this paper, a hypergeometric series expansion for the triple integral is provided. Convergence of the series dependent on the parameters is studied in detail.

Accepted for publication in Rep. Math. Phys