Signatures of Ultrafast Reversal of Excitonic Order in Ta 2 NiSe 5
Name
PhysRevLett.125.267602.pdf
Description
Published version
Size
443.36 KB
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Checksum (MD5)
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Author(s)
Ning, H
Mehio, O
Buchhold, M
Kurumaji, T
Refael, G
Checkelsky, JG
Hsieh, D
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
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).
Version
Final published version
Abstract
© 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
10.1103/PHYSREVLETT.125.267602
