Coherent generation and detection of acoustic phonons in topological nanocavities
Arregui Bravo, Guillermo (Institut Català de Nanociència i Nanotecnologia)
Ortiz, Omar (Centre de Nanosciences et de Nanotechnologies)
Esmann, Martin (Centre de Nanosciences et de Nanotechnologies)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Gómez Carbonell, Carmen (Centre de Nanosciences et de Nanotechnologies)
Mauguin, Olivia (Centre de Nanosciences et de Nanotechnologies)
Perrin, Bernard (Institut de Nanosciences de Paris)
Lemaître, Aristide (Centre de Nanosciences et de Nanotechnologies)
García Fernández, Pedro David (Institut Català de Nanociència i Nanotecnologia)
Lanzillotti-Kimura, Daniel (Centre de Nanosciences et de Nanotechnologies)

Fecha:	2019
Resumen:	Inspired by concepts developed for fermionic systems in the framework of condensed matter physics, topology and topological states are recently being explored also in bosonic systems. Recently, some of these concepts have been successfully applied to acoustic phonons in nanoscale multilayered systems. The reported demonstration of confined topological phononic modes was based on Raman scattering spectroscopy [M. Esmann et al. , Phys. Rev. B 97, 155422 (2018)], yet the resolution did not suffice to determine lifetimes and to identify other acoustic modes in the system. Here, we use time-resolved pump-probe measurements using an asynchronous optical sampling (ASOPS) technique to overcome these resolution limitations. By means of one-dimensional GaAs/AlAs distributed Bragg reflectors (DBRs) used as building blocks, we engineer high frequency (∼200 GHz) topological acoustic interface states. We are able to clearly distinguish confined topological states from stationary band edge modes. The generation/detection scheme reflects the symmetry of the modes directly through the selection rules, evidencing the topological nature of the measured confined state. These experiments enable a new tool in the study of the more complex topology-driven phonon dynamics such as phonon nonlinearities and optomechanical systems with simultaneous confinement of light and sound.
Ayudas:	European Commission 824140 European Commission 715939 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad Fis2015-70862-P European Commission 713450 Ministerio de Economía y Competitividad RyC-2015-18124
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Asynchronous optical samplings ; Fermionic systems ; High frequency HF ; Multi-layered systems ; Opto-mechanical systems ; Raman scattering spectroscopy ; Time resolved pump probes ; Topological state
Publicado en:	APL Photonics, Vol. 4, Issue 3 (March 2019) , art. 30805, ISSN 2378-0967

DOI: 10.1063/1.5082728

7 p, 1.4 MB

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Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
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