Phys. Rev. Lett. 104, 085501 (2010) [4 pages]Coherent Terahertz Sound Amplification and Spectral Line Narrowing in a Stark Ladder Superlattice
See accompanying Physics Viewpoint 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. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.085501
DOI:
10.1103/PhysRevLett.104.085501
PACS:
63.20.kd, 63.22.Np, 72.80.Ey, 73.21.Cd
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