Routine to compute up to the n-th momentum associated to a Chebyshev polynomial expansion
of the density of states. Instead of computing the whole trace of h, we perform the stochastic
evaluation of the trace over a small set of random vectors.
- Parameters:
n (int) – Total number of momentum computed for DoS calculation.
h (ndarray) – Hamiltonian, usually on k=0 (intended for supercell calculations).
r (int) – Number of samples on stochastic ealuation of trace.
- Return type:
ndarray
- Returns:
Array with all momentum.
