Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.14571 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915776809664512 |
|---|---|
| author | Burkard, Ruben Schneider, Benedikt Sbierski, Björn |
| author_facet | Burkard, Ruben Schneider, Benedikt Sbierski, Björn |
| contents | For quantum spin systems in equilibrium, the dynamic structure factor (DSF) is among the most feature-packed experimental observables. However, from a theory perspective it is often hard to simulate in an unbiased and accurate way, especially for frustrated and high-dimensional models at intermediate temperature. To address this challenge, we compute the DSF from a dynamic extension of the high-temperature expansion to frequency moments. We focus on nearest-neighbor Heisenberg models with spin-lengths S=1/2 and 1. We provide comprehensive benchmarks and consider a variety of frustrated two- and three-dimensional antiferromagnets as applications. In particular we shed new light on the anomalous intermediate temperature regime of the S=1/2 triangular lattice model and reproduce the DSF measured recently for the S=1 pyrochlore material NaCaNi2F7. An open-source numerical implementation for arbitrary lattice geometries is also provided. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_14571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamic correlations of frustrated quantum spins from high-temperature expansion Burkard, Ruben Schneider, Benedikt Sbierski, Björn Strongly Correlated Electrons Materials Science Quantum Gases For quantum spin systems in equilibrium, the dynamic structure factor (DSF) is among the most feature-packed experimental observables. However, from a theory perspective it is often hard to simulate in an unbiased and accurate way, especially for frustrated and high-dimensional models at intermediate temperature. To address this challenge, we compute the DSF from a dynamic extension of the high-temperature expansion to frequency moments. We focus on nearest-neighbor Heisenberg models with spin-lengths S=1/2 and 1. We provide comprehensive benchmarks and consider a variety of frustrated two- and three-dimensional antiferromagnets as applications. In particular we shed new light on the anomalous intermediate temperature regime of the S=1/2 triangular lattice model and reproduce the DSF measured recently for the S=1 pyrochlore material NaCaNi2F7. An open-source numerical implementation for arbitrary lattice geometries is also provided. |
| title | Dynamic correlations of frustrated quantum spins from high-temperature expansion |
| topic | Strongly Correlated Electrons Materials Science Quantum Gases |
| url | https://arxiv.org/abs/2505.14571 |