A matrix model of a non-Hermitian ${\hat{I}}^2$-ensemble

Abstract

We introduce the first random matrix model of a complex ${\hat{I}}^2$-ensemble. The matrices are tridiagonal and can be thought of as the non-Hermitian analogue of the Hermite ${\hat{I}}^2$-ensembles discovered by Dumitriu and Edelman (J. Math. Phys., Vol. 43, 5830 (2002)). The main feature of the model is that the exponent ${\hat{I}}^2$ of the Vandermonde determinant in the joint probability density function (j.p.d.f.) of the eigenvalues can take any value in ${\mathbb{R}}_{+}$. However, when ${\hat{I}}^2=2$, the j.p.d.f. does not reduce to that of the Ginibre ensemble, but it contains an extra factor expressed as a multidimensional integral over the space of the eigenvectors.

28 pages, 2 figures. Added Lemma 2.1 and Appendix B. Minor corrections