Possible observation of parametrically amplified coherent phasons in K0.3MoO3 using time-resolved extreme-ultraviolet ARPES
H. Y. Liu, I. Gierz, J. C. Petersen, S. Kaiser, A. Simoncig, A. L., Cavalieri, C. Cacho, I. C. E. Turcu, E. Springate, F. Frassetto, L. Poletto,, S. S. Dhesi, Z. -A. Xu, T. Cuk, R. Merlin, A. Cavalleri
TL;DR
This study uses time-resolved EUV ARPES to observe coherent oscillations in K0.3MoO3, revealing parametric amplification of phasons linked to charge density wave dynamics.
Contribution
It provides the first evidence of parametrically amplified coherent phasons in K0.3MoO3 using advanced time-resolved photoemission spectroscopy.
Findings
Observation of 1.7-THz oscillations in the bonding band.
Anti-bonding band oscillates at half the frequency.
Evidence of parametric amplification of phase fluctuations.
Abstract
We use time- and angle-resolved photoemission spectroscopy (tr-ARPES) in the Extreme Ultraviolet (EUV) to measure the time- and momentum-dependent electronic structure of photo-excited K0.3MoO3. Prompt depletion of the Charge Density Wave (CDW) condensate launches coherent oscillations of the amplitude mode, observed as a 1.7-THz-frequency modulation of the bonding band position. In contrast, the anti-bonding band oscillates at about half this frequency. We attribute these oscillations to coherent excitation of phasons via parametric amplification of phase fluctuations.
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