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Possible observation of parametrically amplified coherent phasons in K0.3MoO3 using time-resolved extreme-ultraviolet ARPES

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arxiv 1206.5743 v3 pith:3UFO5VVJ submitted 2012-06-25 cond-mat.str-el cond-mat.supr-con

H. Y. Liu , I. Gierz , J. C. Petersen , S. Kaiser , A. Simoncig , A. L. Cavalieri , C. Cacho , I. C. E. Turcu
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E. Springate F. Frassetto L. Poletto S. S. Dhesi Z. -A. Xu T. Cuk R. Merlin A. Cavalleri
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classification cond-mat.str-elcond-mat.supr-con
keywords coherentbandmoo3oscillationsphasonstime-amplificationamplified
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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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