I am looking for a matrix C$C$ so that the sequence tr(C^n)$tr(C^n)$ is dense in the set of real numbers. Equivalently (in the 2 by 2$2 \times 2$ case), find a complex number z$z$ so that the sequence z^n+w^n$z^n+w^n$ is dense in R$\mathbb{R}$ where w$w$ is the conjugate of z$z$.