Quasiparticle Interactions in the S = 1/2 Heisenberg Antiferromagnetic Chain CuPzN
Abstract
We investigate spinon--spinon interactions in the quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Cu(C4H4N2)(NO3)2 (CuPzN) using inelastic neutron scattering. At zero field, the spectrum exhibits the canonical multi-spinon continuum of the Heisenberg chain. With increasing field we demonstrate the appearance of an energy gap 2Δ towards momentum q→ 0 between the uniform magnetization precession mode and the shifted spinon continuum. 2Δ is a direct measure of spinon backscattering interactions. Comparison with numerical matrix-product-state calculations and a recent analytical theory shows excellent agreement. By examining the integrable spin-1/2 chain, we provide an example of how quasiparticle interactions can be quantified experimentally in isotropic quantum spin systems.
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BibTeX
@misc{zhao2026quasiparticle,
title = {{Quasiparticle Interactions in the $S = 1/2$ Heisenberg Antiferromagnetic Chain CuPzN}},
author = {Leshan Zhao and Timothy Reeder and Matthew Stone and Daniel G. Mazzone and Jakob Lass and Christof Niedermayer and Daniel H. Reich and Anna Keselman and Oleg A. Starykh and Collin Broholm},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.34536},
eprint = {2610.34536},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.34536},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Quasiparticle Interactions in the S = 1/2 Heisenberg Antiferromagnetic Chain CuPzN
AU - Leshan Zhao
AU - Timothy Reeder
AU - Matthew Stone
AU - Daniel G. Mazzone
AU - Jakob Lass
AU - Christof Niedermayer
AU - Daniel H. Reich
AU - Anna Keselman
AU - Oleg A. Starykh
AU - Collin Broholm
PY - 2026
DA - 2026/10/25
PB - arXiv
DO - 10.48550/arxiv.2610.34536
UR - https://arxiv.org/abs/2610.34536
AB - We investigate spinon--spinon interactions in the quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Cu(C_4H_4N_2)(NO_3)_2 (CuPzN) using inelastic neutron scattering. At zero field, the spectrum exhibits the canonical multi-spinon continuum of the Heisenberg chain. With increasing field we demonstrate the appearance of an energy gap 2Δ towards momentum q→ 0 between the uniform magnetization precession mode and the shifted spinon continuum. 2Δ is a direct measure of spinon backscattering interactions. Comparison with numerical matrix-product-state calculations and a recent analytical theory shows excellent agreement. By examining the integrable spin-1/2 chain, we provide an example of how quasiparticle interactions can be quantified experimentally in isotropic quantum spin systems.
ER -