Coherent Phonons in Solids.
نویسندگان
چکیده
منابع مشابه
Coherent phonons in condensed media
The impulsive excitation and phase sensitive detection of coherent pho nons and phonon polaritons provide a detailed insight into the dynamical properties of matter The experiments are based on optical pump probe techniques with fem tosecond time resolution These techniques enable the detection of amplitude and phase of the coherent lattice motion simultaneously Frequencies in the THz range and...
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There are several classes of coherent phonons whose generation mechanisms are completely different: impulsive stimulated Raman scattering, Brillouin oscillations, and coherent longitudinal-acoustic-phonon Bragg reflection. All of these are investigated in Si/SiGe superlattices using a picosecond ultrasonics technique at room temperature. Bragg reflection for a single vibrational mode is related...
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We review recent studies of coherent phonons (CPs) corresponding to the radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs) and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause bandgap oscillations in SWCNTs, modulating interband transitions at terahertz frequencies. Interband resonances enhance CP signals, allowing for chirality determination. U...
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We investigate the dynamics of coherent optical phonons in tellurium after high-density excitation with femtosecond laser pulses. The data show a continuous redshift of the phonon frequency with increasing excitation density. Experiments with double-pulse excitation prove that the observed frequency shift is of purely electronic origin. We demonstrate that coherent phonons allow monitoring the ...
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We analyze fulleride superconductivity at experimental doping levels, treating the electron-electron and electron-phonon interactions on an equal footing, and demonstrate that the Jahn-Teller phonons create a local (intramolecular) pairing which is surprisingly resistant to the Coulomb repulsion, despite the weakness of retardation in these low-bandwidth systems. The requirement for coherence t...
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ژورنال
عنوان ژورنال: Hyomen Kagaku
سال: 1998
ISSN: 0388-5321,1881-4743
DOI: 10.1380/jsssj.19.64