Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5
© 2020 American Physical Society. In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Hamiltonian, we derive the equations of motion for the Ising order parameter in the phono...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/141439 |
| _version_ | 1826192685516455936 |
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| author | Ning, H Mehio, O Buchhold, M Kurumaji, T Refael, G Checkelsky, JG Hsieh, D |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Ning, H Mehio, O Buchhold, M Kurumaji, T Refael, G Checkelsky, JG Hsieh, D |
| author_sort | Ning, H |
| collection | MIT |
| description | © 2020 American Physical Society. In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Hamiltonian, we derive the equations of motion for the Ising order parameter in the phonon coupled excitonic insulator Ta2NiSe5 and show that it can be controllably reversed on ultrashort timescales using appropriate laser pulse sequences. Using a combination of theory and time-resolved optical reflectivity measurements, we report evidence of such order parameter reversal in Ta2NiSe5 based on the anomalous behavior of its coherently excited order-parameter-coupled phonons. Our Letter expands the field of ultrafast order parameter control beyond spin and charge ordered materials. |
| first_indexed | 2024-09-23T09:27:22Z |
| format | Article |
| id | mit-1721.1/141439 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:27:22Z |
| publishDate | 2022 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1414392023-02-01T20:42:49Z Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 Ning, H Mehio, O Buchhold, M Kurumaji, T Refael, G Checkelsky, JG Hsieh, D Massachusetts Institute of Technology. Department of Physics © 2020 American Physical Society. In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Hamiltonian, we derive the equations of motion for the Ising order parameter in the phonon coupled excitonic insulator Ta2NiSe5 and show that it can be controllably reversed on ultrashort timescales using appropriate laser pulse sequences. Using a combination of theory and time-resolved optical reflectivity measurements, we report evidence of such order parameter reversal in Ta2NiSe5 based on the anomalous behavior of its coherently excited order-parameter-coupled phonons. Our Letter expands the field of ultrafast order parameter control beyond spin and charge ordered materials. 2022-03-31T18:39:10Z 2022-03-31T18:39:10Z 2020 2022-03-31T18:30:17Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/141439 Ning, H, Mehio, O, Buchhold, M, Kurumaji, T, Refael, G et al. 2020. "Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5." Physical Review Letters, 125 (26). en 10.1103/PHYSREVLETT.125.267602 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Ning, H Mehio, O Buchhold, M Kurumaji, T Refael, G Checkelsky, JG Hsieh, D Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title | Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title_full | Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title_fullStr | Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title_full_unstemmed | Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title_short | Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5 |
| title_sort | signatures of ultrafast reversal of excitonic order in ta 2 nise 5 |
| url | https://hdl.handle.net/1721.1/141439 |
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