124008 20250307094029.0 doi 10.1103/PhysRevB.107.035121 sideral 132357 ART-2023-132357 eng Qian, T. Non-Gaussian variational wave functions for interacting bosons on a lattice 2023 Access copy available to the general public Unrestricted A variational method for studying the ground state of strongly interacting quantum many-body bosonic systems is presented. Our approach constructs a class of extensive variational non-Gaussian wave functions which extend Gaussian states by means of nonlinear canonical transformations (NLCTs) on the fields of the theory under consideration. We illustrate this method with the one-dimensional Bose-Hubbard model for which the proposal presented here provides a family of approximate ground states at arbitrarily large values of the interaction strength. We find that, for different values of the interaction, the non-Gaussian NLCT-trial states sensibly improve the ground-state energy estimation when the system is in the Mott phase. info:eu-repo/grantAgreement/ES/DGA/E09-17R-Q-MAD info:eu-repo/grantAgreement/ES/MICINN/PID2020-115221GBC41/AEI/10.13039/501100011033 info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.2 2023 MATERIALS SCIENCE, MULTIDISCIPLINARY 201 / 439 = 0.458 2023 Q2 T2 PHYSICS, CONDENSED MATTER 31 / 79 = 0.392 2023 Q2 T2 PHYSICS, APPLIED 62 / 179 = 0.346 2023 Q2 T2 1.345 2023 Electronic, Optical and Magnetic Materials 2023 Q1 Condensed Matter Physics 2023 Q1 6.3 2023 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Fernández-Melgarejo, J. J. Zueco, D. (orcid)0000-0003-4478-1948 Molina-Vilaplana, J. 107, 3 (2023), 035121 [9 pp.] Phys. Rev. B Physical Review B 2469-9950 328840 http://zaguan.unizar.es/record/124008/files/texto_completo.pdf Versión publicada 3169417 http://zaguan.unizar.es/record/124008/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:124008 articulos driver 2025-03-07-09:38:54 ARTICLE