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Proceedings Paper

Observation of field-induced optical phonon amplification in semiconductor nanostructures
Author(s): W. Liang; Kong-Thon F. Tsen; Otto F. Sankey; Sergiy Mikhailovich Komirenko; Ki Wook Kim; Viatcheslav A. Kochelap; Meng-Chyi Wu; Chong-Long Ho; Wen-Jeng Ho; Hadis Morkoc
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Paper Abstract

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 suing subpicosecond Raman spectroscopy. We suggest that the observed phenomena will have enormous impact on the carrier dynamics in nanoscale semiconductor devices.

Paper Details

Date Published: 30 May 2003
PDF: 14 pages
Proc. SPIE 4992, Ultrafast Phenomena in Semiconductors VII, (30 May 2003); doi: 10.1117/12.479278
Show Author Affiliations
W. Liang, Arizona State Univ. (United States)
Kong-Thon F. Tsen, Arizona State Univ. (United States)
Otto F. Sankey, Arizona State Univ. (United States)
Sergiy Mikhailovich Komirenko, North Carolina State Univ. (United States)
Ki Wook Kim, North Carolina State Univ. (United States)
Viatcheslav A. Kochelap, Institute of Semiconductor Physics (Ukraine)
Meng-Chyi Wu, National Tsing-Hua Univ. (Taiwan)
Chong-Long Ho, Chunghwa Telecom Co., Ltd. (Taiwan)
Wen-Jeng Ho, Chunghwa Telecom Co., Ltd. (Taiwan)
Hadis Morkoc, Virginia Commonwealth Univ. (United States)

Published in SPIE Proceedings Vol. 4992:
Ultrafast Phenomena in Semiconductors VII
Kong-Thon F. Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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