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

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, and A. Cavalleri
Phys. Rev. B 88, 045104 – Published 2 July 2013

Abstract

We use time- and angle-resolved photoemission spectroscopy in the extreme ultraviolet to measure the time- and momentum-dependent electronic structures of photoexcited K0.3MoO3. Prompt depletion of the charge-density wave condensate launches coherent oscillations of the amplitude mode, observed as a 1.7-THz-frequency modulation of the bonding band position. In contrast, the antibonding 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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  • Received 25 June 2012

DOI:https://doi.org/10.1103/PhysRevB.88.045104

©2013 American Physical Society

Authors & Affiliations

H. Y. Liu1,*, I. Gierz1, J. C. Petersen1,2, S. Kaiser1, A. Simoncig1, A. L. Cavalieri1, C. Cacho3, I. C. E. Turcu3, E. Springate3, F. Frassetto4, L. Poletto4, S. S. Dhesi5, Z.-A. Xu6, T. Cuk7, R. Merlin8, and A. Cavalleri1,2,†

  • 1Max Planck Department for Structural Dynamics, CFEL, Hamburg, Germany
  • 2Department of Physics, Clarendon Laboratory, University of Oxford, United Kingdom
  • 3Central Laser Facility, STFC Rutherford Appleton Laboratory, United Kingdom
  • 4CNR-Institute for Photonics and Nanotechnologies, Padova, Italy
  • 5Diamond Light Source Ltd., Chilton, United Kingdom
  • 6Department of Physics, Zhejiang University, Hangzhou, China
  • 7Materials Sciences Division and Physical Biosciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720-1460, USA
  • 8Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA

  • *haiyun.liu@mpsd.cfel.de
  • andrea.cavalleri@mpsd.cfel.de

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Vol. 88, Iss. 4 — 15 July 2013

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