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Title: Symmetry-projected cluster mean-field theory applied to spin systems

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0155765· OSTI ID:1989193

We introduce Sz spin-projection based on cluster mean-field theory and apply it to the ground state of strongly-correlated spin systems. In cluster mean-field, the ground state wavefunction is written as a factorized tensor product of optimized cluster states. In previous work, we have focused on unrestricted cluster mean-field, where each cluster is Sz symmetry adapted. We here remove this restriction by introducing a generalized cluster mean-field (GcMF) theory, where each cluster is allowed to access all Sz sectors, breaking Sz symmetry. In addition, a projection scheme is used to restore global Sz , which gives rise to Sz spin-projected generalized cluster mean-field (Sz GcMF). Both of these extensions contribute to accounting for inter-cluster correlations. We benchmark these methods on the 1D, quasi-2D, and 2D J1 − J2 and XXZ Heisenberg models. Our results indicate that the new methods (GcMF and Sz GcMF) provide a qualitative and semi-quantitative description of the Heisenberg lattices in the regimes considered, suggesting them as useful references for further inter-cluster correlations, which are discussed in this work.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
FG02-09ER16053; SC0001474
OSTI ID:
1989193
Journal Information:
Journal of Chemical Physics, Vol. 159, Issue 8; ISSN 0021--9606
Country of Publication:
United States
Language:
English

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