Ultrafast optical excitation of coherent phonons in a one-dimensional metal at the photoinduced insulator-metal transition | Zendy

J. D. Lee | Zendy; Pilkyung Moon | Zendy; Muneaki Hase | Zendy

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Ultrafast optical excitation of coherent phonons in a one-dimensional metal at the photoinduced insulator-metal transition

Author(s) -

J. D. Lee,

Pilkyung Moon,

Muneaki Hase

Publication year - 2011

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.84.195109

Subject(s) - phonon , excitation , condensed matter physics , ultrashort pulse , physics , charge density wave , adiabatic process , time dependent density functional theory , atomic physics , electron , exciton , materials science , excited state , laser , optics , quantum mechanics , superconductivity

Photoinduced insulator-metal transition from the charge-density wave (CDW) ground state in a one-dimensional electron system is studied within the nonadiabatic theory of electron-phonon coupling. Ultrafast melting and partial recovery of the CDW and its critical slowing down are found to accompany the cooperative lattice response by an electron-phonon energy transfer on the subpicosecond time scale, which is read out by the nonadiabatic depopulation and repopulation of coherent phonons. Further, electron correlation is described in a self-consistent mean-field theory. In the strong electron correlation, the spin-density wave competes with the CDW and the photoinduced responses of the lattice is found to undergo the nonadiabatic-adiabatic transition

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