Lifetime of THz acoustic nanocavity modes.
We present an ultrahigh resolution Raman study of the lifetime of 1 THz acoustic phonons confined in nanocavities. We demonstrate that the cavity Q factor can be controlled by design. Anharmonicity contributes only marginally to limit the cavity phonon lifetime, even at room temperature, while thickness fluctuations in the scale of 1/10 of a unit cell are the main limitation for the performance of THz phonon cavities.
Rozas
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Centro Atómico Bariloche & Instituto Balseiro, CNEA, Bustillo 9500, R8402AGP S. C. de Bariloche, Río Negro, Argentina.
Winter
M F Pascual
MF
Jusserand
B
B
Fainstein
A
A
Perrin
B
B
Semenova
E
E
Lemaître
A
A