Peer-Reviewed Journal Details
Mandatory Fields
Hamann DR, Fahy SB;
1990
June
Physical Review B
Energy measurement in auxiliary-field many-electron calculations.
Validated
()
Optional Fields
41
16
11352
11363
The ground state of a many-electron system can be projected from a trial state using an integral of one-electron projectors over a set of Hubbard-Stratonovich auxiliary fields. We have explored several alternative formulations of this method and find that the convergence of the ground-state energy with the number of field variables can be dramatically improved by choosing the appropriate one. This is illustrated using the two-dimensional Hubbard model as an example. These results are also used to examine the error associated with neglecting the so-called ‘‘sign problem’’ common to quantum Monte Carlo many-fermion calculations.
http://link.aps.org/doi/10.1103/PhysRevB.41.11352
10.1103/PhysRevB.41.11352
Grant Details