Exciton photoemission from a ground state of a solid Ta2Pd3Te5
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916856142495744 |
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| author | Lee, Siwon Jin, Kyung-Hwan Kwon, SeongJin Jung, Hyunjin Won, Choongjae Cheong, Sang-Wook Cho, Gil Young Kim, Jaeyoung Yeom, Han Woong |
| author_facet | Lee, Siwon Jin, Kyung-Hwan Kwon, SeongJin Jung, Hyunjin Won, Choongjae Cheong, Sang-Wook Cho, Gil Young Kim, Jaeyoung Yeom, Han Woong |
| contents | Excitons are bosonic quasiparticles with a variety of applications in optoelectronics, photosyn thesis, and dissipationless informatics, and their lifetime can become sufficiently long to form a quantum condensate. While exciton condensation has been predicted to occur as a ground state of a solid, so called an excitonic insulator, whose material realization has been elusive. Here we report the observation of direct photoemission signals from excitons in a ground state of a very recent excitonic insulator candidate Ta2Pd3Te5 below its metal-insulator transition temperature using orbital-selective angle-resolved photoemission spectroscopy. It is confirmed that the excitons have a lower energy than the valence band maximum to possibly drive the phase transition. This measurement further discloses the size and the unusual odd parity of the exciton wave function. The present finding opens an avenue toward applications of coherent excitons in solid systems and searching for exotic quantum phases of exciton condensates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_16453 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exciton photoemission from a ground state of a solid Ta2Pd3Te5 Lee, Siwon Jin, Kyung-Hwan Kwon, SeongJin Jung, Hyunjin Won, Choongjae Cheong, Sang-Wook Cho, Gil Young Kim, Jaeyoung Yeom, Han Woong Strongly Correlated Electrons Excitons are bosonic quasiparticles with a variety of applications in optoelectronics, photosyn thesis, and dissipationless informatics, and their lifetime can become sufficiently long to form a quantum condensate. While exciton condensation has been predicted to occur as a ground state of a solid, so called an excitonic insulator, whose material realization has been elusive. Here we report the observation of direct photoemission signals from excitons in a ground state of a very recent excitonic insulator candidate Ta2Pd3Te5 below its metal-insulator transition temperature using orbital-selective angle-resolved photoemission spectroscopy. It is confirmed that the excitons have a lower energy than the valence band maximum to possibly drive the phase transition. This measurement further discloses the size and the unusual odd parity of the exciton wave function. The present finding opens an avenue toward applications of coherent excitons in solid systems and searching for exotic quantum phases of exciton condensates. |
| title | Exciton photoemission from a ground state of a solid Ta2Pd3Te5 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.16453 |