In this http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.12.1090&rep=rep1&type=pdf an unconditional lower bound (provided constants used are bounded by absolute value smaller than $1$) of $\Omega(n^2\log n)$ for size of arithmetic circuits computing $n\times n$ Matrix Multiplication is given.
What is the best unconditional lower bound for size of arithmetic circuits computing $n\times n$ Matrix Determinant and Permanent along similar lines?