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Matrix product states with backflow correlations

Guglielmo Lami
•
Giuseppe Carleo
•
Mario Collura
2022
  • journal article

Periodico
PHYSICAL REVIEW. B
Abstract
By taking inspiration from the backflow transformation for correlated systems, we introduce a tensor network Ansatz which extends the well-established matrix product state representation of a quantum many-body wave function. This structure provides enough resources to ensure that states in dimensions larger than or equal to one obey an area law for entanglement. It can be efficiently manipulated to address the ground-state search problem by means of an optimization scheme which mixes tensor-network and variational Monte Carlo algorithms. We benchmark the Ansatz against spin models both in one and two dimensions, demonstrating high accuracy and precision. We finally employ our approach to study the challenging S = 1/2 two-dimensional (2D) J(1) -J(2) model, that it is with the state-of-the-art methods in 2D.
DOI
10.1103/physrevb.106.l081111
WOS
WOS:000853662100002
Archivio
https://hdl.handle.net/20.500.11767/136054
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85136314485
https://arxiv.org/abs/2201.00810
https://ricerca.unityfvg.it/handle/20.500.11767/136054
Diritti
open access
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