Phys. Rev. Lett. 89, 027401 (2002) [4 pages]Excitation of a Breather Mode of Bound Soliton Pairs in Trans-Polyacetylene by Sub-Five-Femtosecond Optical PulsesReceived 23 January 2002; published 19 June 2002 Trans-polyacetylene with a degenerate ground state has a nonlinear excitation of soliton after photoexcitation, due to the electron-phonon coupling. The excess energy of an excited electron-hole pair over a soliton pair creation induces a breather oscillation characterized by collective stretching vibration of the carbon-carbon bonds. A time-frequency analysis of pump probe signal shows that instantaneous frequencies of stretching modes are modulated for ∼50 fs after excitation and the modulation period is 44±3 fs consistent with the theoretical expectation, clearly verifying the breather. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.027401
DOI:
10.1103/PhysRevLett.89.027401
PACS:
78.47.+p, 78.66.Qn, 82.35.Ej
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