The dynamical spin structure factor is computed within a variational framework to study the one-dimensional J1-J2 Heisenberg model. Starting from Gutzwiller-projected fermionic wave functions, the low-energy spectrum is constructed from two-spinon excitations. The direct comparison with Lanczos calculations on small clusters demonstrates the excellent description of both gapless and gapped (dimerized) phases, including incommensurate structures for J2/J1>0.5. Calculations on large clusters show how the intensity evolves when increasing the frustrating ratio and give an unprecedented accurate characterization of the dynamical properties of (nonintegrable) frustrated spin models.

Dynamical structure factor of the J1-J2 Heisenberg model in one dimension: The variational Monte Carlo approach / Ferrari, Francesco; Parola, Alberto; Sorella, Sandro; Becca, Federico. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 97:23(2018), pp. 1-9. [10.1103/PhysRevB.97.235103]

Dynamical structure factor of the J1-J2 Heisenberg model in one dimension: The variational Monte Carlo approach

Ferrari, Francesco
Membro del Collaboration group
;
Parola, Alberto
Membro del Collaboration group
;
Sorella, Sandro
Membro del Collaboration group
;
Becca, Federico
Membro del Collaboration group
2018

Abstract

The dynamical spin structure factor is computed within a variational framework to study the one-dimensional J1-J2 Heisenberg model. Starting from Gutzwiller-projected fermionic wave functions, the low-energy spectrum is constructed from two-spinon excitations. The direct comparison with Lanczos calculations on small clusters demonstrates the excellent description of both gapless and gapped (dimerized) phases, including incommensurate structures for J2/J1>0.5. Calculations on large clusters show how the intensity evolves when increasing the frustrating ratio and give an unprecedented accurate characterization of the dynamical properties of (nonintegrable) frustrated spin models.
97
23
1
9
235103
http://harvest.aps.org/v2/bagit/articles/10.1103/PhysRevB.97.235103/apsxml
https://arxiv.org/abs/1803.02359
Ferrari, Francesco; Parola, Alberto; Sorella, Sandro; Becca, Federico
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11767/87953
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