Improved Green’s function measurement for hybridization expansion quantum Monte Carlo

0395128 - FZÚ 2014 RIV NL eng J - Journal Article
Augustinský, Pavel - Kuneš, Jan
Improved Green’s function measurement for hybridization expansion quantum Monte Carlo.
Computer Physics Communications. Roč. 184, č. 9 (2013), s. 2119-2126. ISSN 0010-4655. E-ISSN 1879-2944
Institutional support: RVO:68378271
Keywords : continuous time quantum Monte Carlo method * Green function estimator
Subject RIV: BE - Theoretical Physics
Impact factor: 2.407, year: 2013

We present an algorithm for measurement of the Green’s function in the hybridization expansion continuous-time quantum Monte-Carlo method based on continuous estimators. Compared to the standard method, the present algorithm has a similar or better accuracy with an improvement notable especially at low perturbation orders and high frequencies. The resulting statistical noise is weakly correlated so high-accuracy data for the numerical analytical continuation can be produced.
Permanent Link: http://hdl.handle.net/11104/0223250