Phonon lifetimes in silicon from 50 GHz to 15 THz - University of ...
Phonon lifetimes in silicon from 50 GHz to 15 THz - University of ...
Phonon lifetimes in silicon from 50 GHz to 15 THz - University of ...
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Lifetime depends on pho<strong>to</strong>excited<br />
carrier density<br />
Lifetime <strong>from</strong> Raman l<strong>in</strong>ewidth<br />
• At low excitation,<br />
lifetime approaches<br />
prediction <strong>from</strong><br />
Raman l<strong>in</strong>ewidth:<br />
pure-dephas<strong>in</strong>g is not<br />
important.<br />
• Lifetime <strong>of</strong> zone<br />
center phonons<br />
decreases at higher<br />
excitation. Spectral<br />
diffusion? Enhanced<br />
coupl<strong>in</strong>g <strong>to</strong> acoustic<br />
modes?