Diffusion Quantum Monte Carlo Calculations of Excited States of Silicon

Details Diffusion Quantum Monte Carlo Calculations of Excited States of Silicon Diffusion Quantum Monte Carlo Calculations of Excited States of Silicon

1998-03-17

arxiv.org/abs/cond-mat/9803207v1

Physics

Condensed Matter

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.57.12140

The band structure of silicon is calculated at the Gamma, X, and L wave vectors using diffusion quantum Monte Carlo methods. Excited states are formed by promoting an electron from the valence band into the conduction band. We obtain good agreement with experiment for states around the gap region and demonstrate that the method works equally well for direct and indirect excitations, and that one can calculate many excited states at each wave vector. This work establishes the fixed-node DMC approach as an accurate method for calculating the energies of low lying excitations in solids.

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