Gutzwiller-projected fermionic states can be efficiently implemented within quantum Monte Carlo calculations to define extremely accurate variational wave functions for Heisenberg models on frustrated two-dimensional lattices, not only for the ground state but also for low-energy excitations. The application of few Lanczos steps on top of these states further improves their accuracy, allowing calculations on large clusters. In addition, by computing both the energy and its variance, it is possible to obtain reliable estimations of exact results. Here, we report the cases of the frustrated Heisenberg models on square and Kagome lattices.
Lanczos steps to improve variational wave functions / Becca, F.; Hu, W. J.; Iqbal, Y.; Parola, A.; Poilblanc, D.; Sorella, S.. - In: JOURNAL OF PHYSICS. CONFERENCE SERIES. - ISSN 1742-6588. - 640:1(2015), pp. 1-7. (Intervento presentato al convegno 26th IUPAP Conference on Computational Physics, CCP 2014 tenutosi a George Sherman Union at Boston University, usa nel 2014) [10.1088/1742-6596/640/1/012039].
Lanczos steps to improve variational wave functions
Becca, F.
Membro del Collaboration group
;Parola, A.Membro del Collaboration group
;Poilblanc, D.Membro del Collaboration group
;Sorella, S.
2015-01-01
Abstract
Gutzwiller-projected fermionic states can be efficiently implemented within quantum Monte Carlo calculations to define extremely accurate variational wave functions for Heisenberg models on frustrated two-dimensional lattices, not only for the ground state but also for low-energy excitations. The application of few Lanczos steps on top of these states further improves their accuracy, allowing calculations on large clusters. In addition, by computing both the energy and its variance, it is possible to obtain reliable estimations of exact results. Here, we report the cases of the frustrated Heisenberg models on square and Kagome lattices.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
