Cerenkov emission of terahertz acoustic-phonons from graphene

Zhao, C. X.; Xu, W.; Peeters, F. M.
June 2013
Applied Physics Letters;6/3/2013, Vol. 102 Issue 22, p222101
Academic Journal
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.


Related Articles

  • Nonequilibrium Carriers in an Intrinsic Graphene. Vasko, F. T.; Romanets, P. N.; Balev, O. G.; Ryzhii, V. // AIP Conference Proceedings;1/4/2010, Vol. 1199 Issue 1, p545 

    We examine nonequilibrium carriers (electrons and holes) excited by steady-state electric field or mid-IR pumping in an intrinsic graphene at low temperatures. The energy distributions of carriers are calculated using a quasiclassic kinetic equation which accounts for the energy relaxation due...

  • Radiative damping and synchronization in a graphene-based terahertz emitter. Moskalenko, A. S.; Mikhailov, S. A. // Journal of Applied Physics;2014, Vol. 115 Issue 20, p203110-1 

    We investigate the collective electron dynamics in a recently proposed graphene-based terahertz emitter under the influence of the radiative damping effect, which is included self-consistently in a molecular dynamics approach. We show that under appropriate conditions synchronization of the...

  • High ambipolar and balanced carrier mobility in regioregular poly(3-hexylthiophene). Choulis, S. A.; Kim, Y.; Nelson, J.; Bradley, D. D. C.; Giles, M.; Shkunov, M.; McCulloch, I. // Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3890 

    The carrier transport of carefully purified regioregular poly(3-hexylthiophene) films has been studied using time-of-flight photocurrent measurements. We find balanced ambipolar transport with a room-temperature mobility for holes of 3×10-4 cm2 V-1 s-1 and for electrons of 1.5×10-4 cm2...

  • Selecting a paraxial region profile for the accelerating structure of an electron-positron collider. Bogomolov, Ya. L.; Semenov, E. S.; Yunakovsky, A. D. // Technical Physics Letters;Jul2009, Vol. 35 Issue 7, p597 

    The effect of perturbations in the profile of a paraxial region boundary on the electrodynamic characteristics of the accelerating structure of an electron-positron collider has been studied. In addition to the traditional elliptic profiles, configurations that form an electric field with a...

  • Direct measurement of the characteristic three-body electron attachment time in the atmospheric air in direct current electric field. Shutov, A. V.; Smetanin, I. V.; Ionin, A. A.; Levchenko, A. O.; Seleznev, L. V.; Sinitsyn, D. V.; Ustinovskii, N. N.; Zvorykin, V. D. // Applied Physics Letters;7/15/2013, Vol. 103 Issue 3, p034106 

    We report the results of theoretical and experimental study of the characteristic time for three-body attachment of electrons produced by 100 fs UV laser pulse in the atmosphere air in the external DC electric field ranged from 0.2 to 10 kV/cm.

  • Temperature dependence of the electric field gradient in GaN measured with the PAC-probe 181Hf. Lorenz, K.; Geruschke, T.; Alves, E.; Vianden, R. // Hyperfine Interactions;2007, Vol. 177 Issue 1-3, p89 

    Epitaxial GaN layers were implanted with radioactive 181Hf ions in order to study the temperature dependence of the electric field gradient (EFG) at the site of the probes after rapid thermal annealing at 1273 K. Results are compared to recent measurements with the 111In probe that showed a...

  • Multiphoton intraband absorption of electromagnetic waves and stimulated scattering by optical phonons in the superlattice. Vyazovskiĭ, M. V.; Syroedov, G. A. // Technical Physics;Feb2008, Vol. 53 Issue 2, p249 

    Multiphoton intraminiband absorption of the electromagnetic wave and stimulated scattering by optical phonons in the semiconductor superlattice are considered. The absorption coefficient is found without using the quantum kinetic equation. The absorbed energy is plotted versus the electric field...

  • Acoustic Phonon Dynamics in an Optical Microcavity: Enhanced Coherent Generation and Detection. Lanzillotti-Kimura, N. D.; Fainstein, A.; Jusserand, B.; Perrin, B. // AIP Conference Proceedings;1/4/2010, Vol. 1199 Issue 1, p161 

    The coherent generation and detection of acoustic phonons in a superlattice embedded in an optical microcavity is theoretically analyzed. In this optical resonator, femtosecond light pulses can be confined and amplified. We show that the acoustic phonon generation process is enhanced as the...

  • The role of electron heat flux in guide-field magnetic reconnection. Hesse, Michael; Kuznetsova, Masha; Birn, Joachim // Physics of Plasmas;Dec2004, Vol. 11 Issue 12, p5387 

    A combination of analytical theory and particle-in-cell simulations are employed in order to investigate the electron dynamics near and at the site of guide field magnetic reconnection. A detailed analysis of the contributions to the reconnection electric field shows that both bulk inertia and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics