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• W4323659897 abstract "The lowest-lying fundamental excitation of an incommensurate charge density wave (CDW) material is widely believed to be a massless phason -- a collective modulation of the phase of the CDW order parameter. However, as first pointed out by Lee and Fukuyama, long-range Coulomb interactions should push the phason energy up to the plasma energy of the CDW condensate, resulting in a massive phason and a fully gapped spectrum. Whether such behavior occurs in a CDW system has been unresolved for more than four decades. Using time-domain THz emission spectroscopy, we investigate this issue in the material (TaSe$_4$)$_2$I, a classical example of a quasi-one-dimensional CDW insulator. Upon transient photoexcitation at low temperatures, we find the material strikingly emits coherent, narrow-band THz radiation. The frequency, polarization and temperature-dependence of the emitted radiation imply the existence of a phason that acquires mass by coupling to long-range Coulomb interaction. Our observations constitute the first direct evidence of the massive Lee-Fukuyama phason and highlight the potential applicability of fundamental collective modes of correlated materials as compact and robust sources of THz radiation." @default.
• W4323659897 created "2023-03-10" @default.
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• W4323659897 date "2023-03-09" @default.
• W4323659897 modified "2023-10-14" @default.
• W4323659897 title "Observation of a massive phason in a charge-density-wave insulator" @default.
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• W4323659897 doi "https://doi.org/10.1038/s41563-023-01504-5" @default.
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