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- K Van Houcke, S M A Rombouts, L Pollet
- Physical review. E, Statistical, nonlinear, and…
- 2006

A quantum Monte Carlo method with a nonlocal update scheme is presented. The method is based on a path-integral decomposition and a worm operator which is local in imaginary time. It generates states with a fixed number of particles and respects other exact symmetries. Observables like the equal-time Green's function can be evaluated in an efficient way. To… (More)

- S M A Rombouts, K Van Houcke, L Pollet
- Physical review letters
- 2006

We present a new nonlocal updating scheme for quantum Monte Carlo simulations, which conserves particle number and other symmetries. It allows exact symmetry projection and direct evaluation of the equal-time Green's function and other observables in the canonical ensemble. The method is applicable to a wide variety of systems. We show results for bosonic… (More)

- R Rossi, N Prokof 'ev, B Svistunov, K Van Houcke, F Werner
- 2017

– It is commonly believed that in quantum Monte Carlo approaches to fermionic many-body problems, the infamous sign problem generically implies prohibitively large computational times for obtaining thermodynamic-limit quantities. We point out that for convergent Feynman diagrammatic series evaluated with the Monte Carlo algorithm of [Rossi,… (More)

- Lode Pollet, Matthias Troyer, Kris Van Houcke, Stefan M A Rombouts
- Physical review letters
- 2006

The ground state phase diagram of the one-dimensional Bose-Fermi Hubbard model is studied in the canonical ensemble using a quantum Monte Carlo method. We focus on the case where both species have half filling in order to maximize the pairing correlations between the bosons and the fermions. In case of equal hopping we distinguish among phase separation, a… (More)

- J Dukelsky, G Ortiz, S M A Rombouts, K Van Houcke
- Physical review letters
- 2006

We introduce an exactly solvable model to study the competition between the Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) and breached-pair superfluid in strongly interacting ultracold asymmetric Fermi gases. One can thus investigate homogeneous and inhomogeneous states on equal footing and establish the quantum phase diagram. For certain values of the filling… (More)

- Lode Pollet, Stefan M A Rombouts, Kris Van Houcke, Kris Heyde
- Physical review. E, Statistical, nonlinear, and…
- 2004

Based on Peskun's theorem it is shown that optimal transition matrices in Markov chain Monte Carlo should have zero diagonal elements except for the diagonal element corresponding to the largest weight. We will compare the statistical efficiency of this sampler to existing algorithms, such as heat-bath updating and the Metropolis algorithm. We provide… (More)

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