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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.09235 |
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| _version_ | 1866909645787889664 |
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| author | Kengle, Caitlin S. Schnitzer, Noah Peterson, Elizabeth A. Guo, Chunyu Zhang, Ling Cook, Matthew S. Zhu, Jian-Xin Thomas, Sean M. Moll, Philip J. W. Ronning, Filip Rosa, Priscila F. S. |
| author_facet | Kengle, Caitlin S. Schnitzer, Noah Peterson, Elizabeth A. Guo, Chunyu Zhang, Ling Cook, Matthew S. Zhu, Jian-Xin Thomas, Sean M. Moll, Philip J. W. Ronning, Filip Rosa, Priscila F. S. |
| contents | Excitonic insulators are electronically-driven phases of matter characterized by the spontaneous condensation of electron-hole pairs. Here we show that La$_3$Cd$_2$As$_6$ undergoes a transition at $T_{0}=278$ K to a highly insulating state with no accompanying structural transition. We observe quasi-two-dimensional electrical transport and charge fluctuations consistent with an electronic transition enabled by enhanced Coulomb interactions. Density functional theory calculations are unable to replicate the insulating ground state. Our results support the opening of a gap by excitonic effects at $T_{0}$, placing La$_3$Cd$_2$As$_6$ as a rare example of a bulk excitonic insulator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_09235 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Putative excitonic insulating state in narrow-gap semiconductor La$_3$Cd$_2$As$_6$ Kengle, Caitlin S. Schnitzer, Noah Peterson, Elizabeth A. Guo, Chunyu Zhang, Ling Cook, Matthew S. Zhu, Jian-Xin Thomas, Sean M. Moll, Philip J. W. Ronning, Filip Rosa, Priscila F. S. Strongly Correlated Electrons Excitonic insulators are electronically-driven phases of matter characterized by the spontaneous condensation of electron-hole pairs. Here we show that La$_3$Cd$_2$As$_6$ undergoes a transition at $T_{0}=278$ K to a highly insulating state with no accompanying structural transition. We observe quasi-two-dimensional electrical transport and charge fluctuations consistent with an electronic transition enabled by enhanced Coulomb interactions. Density functional theory calculations are unable to replicate the insulating ground state. Our results support the opening of a gap by excitonic effects at $T_{0}$, placing La$_3$Cd$_2$As$_6$ as a rare example of a bulk excitonic insulator. |
| title | Putative excitonic insulating state in narrow-gap semiconductor La$_3$Cd$_2$As$_6$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.09235 |