Coherent terahertz sound amplification and spectral line narrowing in a stark ladder superlattice.
Phys Rev Lett
; 104(8): 085501, 2010 Feb 26.
Article
en En
| MEDLINE
| ID: mdl-20366943
ABSTRACT
The bias voltage applied to a weakly coupled n-doped GaAs/AlAs superlattice increases the amplitude of the coherent hypersound oscillations generated by a femtosecond optical pulse. This bias-induced amplitude increase and experimentally observed spectral narrowing of the superlattice phonon mode with a frequency 441 GHz provides the evidence for hypersound amplification by stimulated emission of phonons in a system where the inversion of the electron populations for phonon-assisted transitions exists.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2010
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Article
País de afiliación:
Reino Unido