Observation of a massive phason in a charge-density-wave insulator
© 2023. The Author(s), under exclusive licence to Springer Nature Limited..
The lowest-lying fundamental excitation of an incommensurate charge-density-wave material is believed to be a massless phason-a collective modulation of the phase of the charge-density-wave order parameter. However, long-range Coulomb interactions should push the phason energy up to the plasma energy of the charge-density-wave condensate, resulting in a massive phason and fully gapped spectrum1. Using time-domain terahertz emission spectroscopy, we investigate this issue in (TaSe4)2I, a quasi-one-dimensional charge-density-wave insulator. On transient photoexcitation at low temperatures, we find the material strikingly emits coherent, narrowband terahertz radiation. The frequency, polarization and temperature dependences of the emitted radiation imply the existence of a phason that acquires mass by coupling to long-range Coulomb interactions. Our observations underscore the role of long-range interactions in determining the nature of collective excitations in materials with modulated charge or spin order.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:22 |
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| Enthalten in: |
Nature materials - 22(2023), 4 vom: 10. Apr., Seite 429-433 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Kim, Soyeun [VerfasserIn] |
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| Anmerkungen: |
Date Completed 03.04.2023 Date Revised 03.04.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1038/s41563-023-01504-5 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM354004697 |
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| 500 | |a Date Revised 03.04.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a © 2023. The Author(s), under exclusive licence to Springer Nature Limited. | ||
| 520 | |a The lowest-lying fundamental excitation of an incommensurate charge-density-wave material is believed to be a massless phason-a collective modulation of the phase of the charge-density-wave order parameter. However, long-range Coulomb interactions should push the phason energy up to the plasma energy of the charge-density-wave condensate, resulting in a massive phason and fully gapped spectrum1. Using time-domain terahertz emission spectroscopy, we investigate this issue in (TaSe4)2I, a quasi-one-dimensional charge-density-wave insulator. On transient photoexcitation at low temperatures, we find the material strikingly emits coherent, narrowband terahertz radiation. The frequency, polarization and temperature dependences of the emitted radiation imply the existence of a phason that acquires mass by coupling to long-range Coulomb interactions. Our observations underscore the role of long-range interactions in determining the nature of collective excitations in materials with modulated charge or spin order | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Lv, Yinchuan |e verfasserin |4 aut | |
| 700 | 1 | |a Sun, Xiao-Qi |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Chengxi |e verfasserin |4 aut | |
| 700 | 1 | |a Bielinski, Nina |e verfasserin |4 aut | |
| 700 | 1 | |a Murzabekova, Azel |e verfasserin |4 aut | |
| 700 | 1 | |a Qu, Kejian |e verfasserin |4 aut | |
| 700 | 1 | |a Duncan, Ryan A |e verfasserin |4 aut | |
| 700 | 1 | |a Nguyen, Quynh L D |e verfasserin |4 aut | |
| 700 | 1 | |a Trigo, Mariano |e verfasserin |4 aut | |
| 700 | 1 | |a Shoemaker, Daniel P |e verfasserin |4 aut | |
| 700 | 1 | |a Bradlyn, Barry |e verfasserin |4 aut | |
| 700 | 1 | |a Mahmood, Fahad |e verfasserin |4 aut | |
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