Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 32: Transport: Nanomechanics and Optomechanics (jointly with CPP, DY, BP, DF)
TT 32.5: Vortrag
Dienstag, 21. März 2017, 15:00–15:15, HSZ 201
Hypersound spacerless cavities — •M. Esmann1, F. Lamberti1, O. Krebs1, L. Lanco1, I. Favero2, P. Senellart1, A. Lemaître1, C. Gomez1, and N.D. Lanzillotti-Kimura1 — 1Centre de Nanosciences et des Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 91460 Marcoussis, France — 2Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénoménes Quantiques, CNRS-UMR 7162, 75013 Paris, France
We introduce new strategies to engineer and study semiconductor nanostructures capable of confining, controlling the propagation, and manipulating acoustic phonons in the GHz-THz frequency range. Superlattices work as high reflectance phononic mirrors and constitute a fundamental building block for the conception of more complex devices. Acoustic cavities are capable of confining and amplifying the hypersound field both spatially and in the spectral domains. Usually, an acoustic cavity is formed by two identical distributed Bragg reflectors embedding an acoustic spacer, acting in a similar way to a Fabry-Perot resonator. We design a novel kind of phononic cavities where no spacer is needed, based on the engineering of the phonon phase in the interface between two superlattices. Such kind of resonators can be combined in coupled-acoustic cavity structures such as molecules and coupled-resonator waveguides able to evidence novel physical phenomena such as acoustic Bloch oscillations.
[1] A. Fainstein et al. PRL 110, 037403 (2013)
[2] M. Xiao et al. Nature Physics 11, 240 (2015)