title: Lifetime of THz acoustic nanocavity modes.
abstract: 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.
authors.affiliation: Centro Atómico Bariloche & Instituto Balseiro, CNEA, Bustillo 9500, R8402AGP S. C. de Bariloche, Río Negro, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Rozas
authors.forename: M F Pascual
authors.initials: MF
authors.lastname: Winter
authors.forename: B
authors.initials: B
authors.lastname: Jusserand
authors.forename: A
authors.initials: A
authors.lastname: Fainstein
authors.forename: B
authors.initials: B
authors.lastname: Perrin
authors.forename: E
authors.initials: E
authors.lastname: Semenova
authors.forename: A
authors.initials: A
authors.lastname: Lemaître