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- W2042783102 abstract "We present a theoretical study of the electrical generation of acoustic-phonon emission from graphene at room temperature. The drift velocity (vx) and temperature of electrons driven by dc electric field (Fx) are determined by solving self-consistently the momentum- and energy-balance equations derived from the Boltzmann equation. We find that in the presence of impurity, acoustic- and optic-phonon scattering, vx can be much larger than the longitudinal (vl) and transverse (vt) sound velocities in graphene even within the linear response regime. As a result, although the acoustic Cerenkov effect cannot be obviously seen in the analytical formulas, the enhanced acoustic-phonon emission can be observed with increasing Fx when vx>vl and v>vt. The frequency of acoustic-phonon emission from graphene can be above 10 THz, which is much higher than that generated from conventional semiconductor systems. This study is pertinent to the application of graphene as hypersonic devices such as terahertz sound sources." @default.
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- W2042783102 date "2013-06-03" @default.
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- W2042783102 title "Cerenkov emission of terahertz acoustic-phonons from graphene" @default.
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- W2042783102 doi "https://doi.org/10.1063/1.4808392" @default.
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