Supplementary Material S1, Supplementary Material S2, Supplementary Material S3

Refer to the Supplemental Material S1 for details on the convergence test. Refer to the Supplemental Material S2 for details on the benchmark test using the local-density approximation functional. Refer to the Supplemental Material S3 for details on the carrier density of states at 20 fs following excitation by a 266 nm laser.