Quasiparticle Spectroscopy of Chiral Charge Order
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arXiv
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| Autores principales: | , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908283250409472 |
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| author | Zheng, Jiangchang Chen, Caiyun Pan, Gaopei Zhang, Xu Chen, Chen Da Liao, Yuan Pokharel, Ganesh Salinas, Andrea Capa Wei, Yizhou Po, Hoi Chun Pan, Ding Wilson, Stephen D. Meng, Zi Yang Jäck, Berthold |
| author_facet | Zheng, Jiangchang Chen, Caiyun Pan, Gaopei Zhang, Xu Chen, Chen Da Liao, Yuan Pokharel, Ganesh Salinas, Andrea Capa Wei, Yizhou Po, Hoi Chun Pan, Ding Wilson, Stephen D. Meng, Zi Yang Jäck, Berthold |
| contents | Electronic interactions can give rise to novel charge density waves with unconventional ground states. Recent experiments report evidence for a chiral charge density wave (CDW) that breaks time-reversal symmetry in the kagome metals AV$_3$Sb$_5$ (A=K, Rb or Cs). Theoretical analyses propose a topologically nontrivial loop current phase that spontaneously breaks time-reversal symmetry as the favorable CDW ground state. However, spectroscopic insights into the quasiparticle excitations of chiral charge order in AV$_3$Sb$_5$ compounds are still missing and conflicting experimental results question the presence of a loop current phase. We employed individual magnetic atoms as local quantum sensors to examine the quasiparticle excitations of chiral charge order in CsV$_3$Sb$_5$ with the scanning tunneling microscope (STM). Our spectroscopic measurements show that the magnetic moment of Co induces a spatially-localized low-energy state in the CDW phase. The distinct spectral signatures of this state are consistent with theoretical expectations for the quasiparticle excitation of a loop current order parameter, while control experiment rule out alternative scenario. Our work provides unique insights into the ground state of chiral charge order in CsV$_3$Sb$_5$ and introduces a novel method to examine other topological states, such as the fractional Chern insulators, with the STM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19032 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasiparticle Spectroscopy of Chiral Charge Order Zheng, Jiangchang Chen, Caiyun Pan, Gaopei Zhang, Xu Chen, Chen Da Liao, Yuan Pokharel, Ganesh Salinas, Andrea Capa Wei, Yizhou Po, Hoi Chun Pan, Ding Wilson, Stephen D. Meng, Zi Yang Jäck, Berthold Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science Electronic interactions can give rise to novel charge density waves with unconventional ground states. Recent experiments report evidence for a chiral charge density wave (CDW) that breaks time-reversal symmetry in the kagome metals AV$_3$Sb$_5$ (A=K, Rb or Cs). Theoretical analyses propose a topologically nontrivial loop current phase that spontaneously breaks time-reversal symmetry as the favorable CDW ground state. However, spectroscopic insights into the quasiparticle excitations of chiral charge order in AV$_3$Sb$_5$ compounds are still missing and conflicting experimental results question the presence of a loop current phase. We employed individual magnetic atoms as local quantum sensors to examine the quasiparticle excitations of chiral charge order in CsV$_3$Sb$_5$ with the scanning tunneling microscope (STM). Our spectroscopic measurements show that the magnetic moment of Co induces a spatially-localized low-energy state in the CDW phase. The distinct spectral signatures of this state are consistent with theoretical expectations for the quasiparticle excitation of a loop current order parameter, while control experiment rule out alternative scenario. Our work provides unique insights into the ground state of chiral charge order in CsV$_3$Sb$_5$ and introduces a novel method to examine other topological states, such as the fractional Chern insulators, with the STM. |
| title | Quasiparticle Spectroscopy of Chiral Charge Order |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2503.19032 |