Abstract
We investigate the effects of three-body and backflow correlations on ground-state properties of the two-dimensional electron gas by both variational and fixed-node Greens function Monte Carlo methods. It is found that the backflow effect is dominant over the three-body effect at high density (rs1) while they are of equal importance at the lowest density considered (rs20). With these correlations, we find significant improvements in both variational and fixed-node energies over the Slater-Jastrow results which consider only two-body correlation. The effects are comparable to those in bulk He3. We present an analytic expression for the correlation energy of the two-dimensional electron gas as a function of the density.
Original language | English (US) |
---|---|
Pages (from-to) | 12037-12046 |
Number of pages | 10 |
Journal | Physical Review B |
Volume | 48 |
Issue number | 16 |
DOIs | |
State | Published - 1993 |
ASJC Scopus subject areas
- Condensed Matter Physics