Observation of optical phonon instability induced by drifting electrons in semiconductor nanostructures

Liang, W.; Tsen, K. T.; Sankey, Otto F.; Komirenko, S. M.; Kim, K. W.; Kochelap, V. A.; Wu, Meng-Chyi; Ho, Chong-Long; Ho, Wen-Jeng; Morkoç, H.
March 2003
Applied Physics Letters;3/24/2003, Vol. 82 Issue 12, p1968
Academic Journal
We have experimentally proven the Cerenkov generation of optical phonons by drifting electrons in a semiconductor. We observe an instability of the polar optical phonons in nanoscale semiconductors that occurs when electrons are accelerated to very high velocities by intense electric fields. The instability is observed when the electron drift velocity is larger than the phase velocity of optical phonons and rather resembles a "sonic boom" for optical phonons. The effect is demonstrated in p-i-n semiconductor nanostructures by using subpicosecond Raman spectroscopy.


Related Articles

  • Cerenkov acoustic-phonon emission generated electrically from a polar semiconductor. Zhao, X. F.; Zhang, J.; Chen, S. M.; Xu, W. // Journal of Applied Physics;May2009, Vol. 105 Issue 10, p104514 

    We present a systematic theoretical study of the Cerenkov acoustic-phonon emission from a polar semiconductor such as GaAs driven by dc electric field. The drift electron velocity and electron-temperature in the system are determined by solving self-consistently the momentum- and energy-balance...

  • Enhanced response of current-driven coupled quantum wells. Balassis, Antonios; Gumbs, Godfrey // Journal of Applied Physics;Nov2009, Vol. 106 Issue 10, p103102-1 

    We have investigated the conditions necessary to achieve stronger Cherenkov-like instability of plasma waves leading to emission in the terahertz regime for semiconductor quantum wells. The surface response function is calculated for a bilayer two-dimensional electron gas (2DEG) system in the...

  • C?erenkov superradiance from a subnanosecond electron bunch in a sectional decelerating system. Yalandin, M. I.; Shunailov, S. A.; Shpak, V. G.; Ginzburg, N. S.; Zotova, I. V.; Sergeev, A. S.; Phelps, A. D. R.; Cross, A. W.; Aitken, P. // Technical Physics Letters;Dec97, Vol. 23 Issue 12, p948 

    Induced coherent radiation (superradiance) from a subnanosecond electron bunch in a combined decelerating system has been investigated experimentally. In a first section formed by a periodically modulated waveguide, the density of the bunch is modulated and it then radiates in a second section...

  • Effect of beam thickness in a Cherenkov laser. Ueda, T.; Shiozawa, T. // Applied Physics Letters;12/25/1995, Vol. 67 Issue 26, p3838 

    Examines the effect of electron beam thickness in a two-dimensional Cherenkov laser. Use of the fluid model for the electron beam; Transverse variation of the drift velocity for the electron beam; Optimum thickness for an efficient use of the Cherenkov laser electron beam.

  • First operation of a multi-electron-beam Cherenkov free-electron laser oscillator. Qingyuan Wang; Shanfu Yu; Peijue Xun; Shenggang Liu; Kesong Hu; Yutao Chen; Pinshan Wang // Applied Physics Letters;11/4/1991, Vol. 59 Issue 19, p2378 

    Demonstrates the physical mechanism underlying multi-electron-beam Cherenkov free-electron lasers. Introduction of the electron beams into a multi-dielectric cavity; Generation of stimulated Cherenkov radiation; Measurement of the interaction efficiency.

  • Pseudospark-based electron beam and Cherenkov maser experiments. Yin, H.; Robb, G. R. M.; He, W.; Phelps, A. D. R.; Cross, A. W.; Ronald, K. // Physics of Plasmas;Dec2000, Vol. 7 Issue 12 

    Detailed experimental results from the first free-electron maser experiment to use a pseudospark-based electron beam are presented in this paper. These include the design and realization of a pseudospark-based electron beam source and Cherenkov maser experiment. A pulsed, 70-80 kV, 10 A electron...

  • Theoretical studies of high-power Cerenkov amplifiers. Schächter, L.; Nation, J. A.; Shiffler, D. A. // Journal of Applied Physics;7/1/1991, Vol. 70 Issue 1, p114 

    Presents theoretical studies of high-power Cerenkov amplifiers. Methodology; Results and discussion; Conclusion.

  • Observation of narrow-band Si L-edge Cˇerenkov radiation generated by 5 MeV electrons. Knulst, W.; Luiten, O. J.; van der Wiel, M. J.; Verhoeven, J. // Applied Physics Letters;10/29/2001, Vol. 79 Issue 18, p2999 

    Narrow-band Cˇerenkov radiation at 99.7 eV has been generated by 5 MeV electrons in a silicon foil, with a yield ∼1×10[sup -3] photon/electron. These measurements demonstrate the feasibility of a compact, narrow-band, and intense soft x-ray source based on small electron...

  • Can electrons ride an optical boom? Watson, Andrew // New Scientist;10/21/95, Vol. 148 Issue 2000, p22 

    Reports that an Israeli researcher suggests that under right conditions, electrons should be able to pick up energy in the reverse of an optical boom, which could offer a more efficient way to accelerate particles than existing techniques. Optical boom also known as Cerenkov radiation; Reverse...


Read the Article


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

Try another library?
Sign out of this library

Other Topics