Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.14163 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866929324056117248 |
|---|---|
| author | Chi, Runze Hu, Jiahang Liao, Hai-Jun Xiang, T. |
| author_facet | Chi, Runze Hu, Jiahang Liao, Hai-Jun Xiang, T. |
| contents | We employ tensor network renormalization to explore the dynamical spectra of the easy-axis triangular-lattice antiferromagnet (TLAF) in a magnetic field. Our analysis identifies two distinct low-energy magnon excitations: a gapless Goldstone mode and a gapped mode. At zero field, the spectra display two nearly degenerate roton modes near the M point. With the increase of the magnetic field within the Y-shape superfluid phase, these modes diverge, with the roton excitation vanishing from the Goldstone mode branch, suggesting that the roton dip in this mode may just result from the energy-level repulsion imposed by the roton excitation in the gapped mode. Moreover, the in-plane spectral function shows substantial weight in high energies in the same spin excitation channel where the low-energy roton excitation appears. However, these roton excitations are absent in the V-shape supersolid phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14163 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dynamical Spectra of Spin Supersolid States in Triangular Antiferromagnets Chi, Runze Hu, Jiahang Liao, Hai-Jun Xiang, T. Strongly Correlated Electrons We employ tensor network renormalization to explore the dynamical spectra of the easy-axis triangular-lattice antiferromagnet (TLAF) in a magnetic field. Our analysis identifies two distinct low-energy magnon excitations: a gapless Goldstone mode and a gapped mode. At zero field, the spectra display two nearly degenerate roton modes near the M point. With the increase of the magnetic field within the Y-shape superfluid phase, these modes diverge, with the roton excitation vanishing from the Goldstone mode branch, suggesting that the roton dip in this mode may just result from the energy-level repulsion imposed by the roton excitation in the gapped mode. Moreover, the in-plane spectral function shows substantial weight in high energies in the same spin excitation channel where the low-energy roton excitation appears. However, these roton excitations are absent in the V-shape supersolid phase. |
| title | Dynamical Spectra of Spin Supersolid States in Triangular Antiferromagnets |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2404.14163 |