79 citations · 173 across the 3 of their papers we have counts for
3 papers
Eliminating spin contamination in auxiliary-field quantum Monte Carlo: realistic potential energy curve of F2
Wirawan Purwanto, W. A. Al-Saidi, Henry Krakauer +1
The use of an approximate reference state wave function |Phi_r> in electronic many-body methods can break the spin symmetry of Born-Oppenheimer spin-independent Hamiltonians. This…
Phaseless auxiliary-field quantum Monte Carlo calculations with planewaves and pseudopotentials--applications to atoms and molecules
Malliga Suewattana, Wirawan Purwanto, Shiwei Zhang +2
The phaseless auxiliary-field quantum Monte Carlo (AF QMC) method [S. Zhang and H. Krakauer, Phys. Rev. Lett. 90, 136401 (2003)] is used to carry out a systematic study of the diss…
Correlation effects in the ground state of trapped atomic Bose gases
Wirawan Purwanto, Shiwei Zhang
We study the effects of many-body correlations in trapped ultracold atomic Bose gases. We calculate the ground state of the gas using a ground-state auxiliary-field quantum Monte C…