title: High-order path-integral Monte Carlo methods for solving quantum dot problems.
abstract: The conventional second-order path-integral Monte Carlo method is plagued with the sign problem in solving many-fermion systems. This is due to the large number of antisymmetric free-fermion propagators that are needed to extract the ground state wave function at large imaginary time. In this work we show that optimized fourth-order path-integral Monte Carlo methods, which use no more than five free-fermion propagators, can yield accurate quantum dot energies for up to 20 polarized electrons with the use of the Hamiltonian energy estimator.
authors: Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
authors: Siu A
authors: SA
authors: Chin