Generation and Propagation of Superhigh-Frequency Bulk Acoustic Waves in GaAs

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Autor(es): dc.contributorLeibniz-Institut im Forschungsverbund Berlin E.V.-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorMachado, Diego H.O. [UNESP]-
Autor(es): dc.creatorCrespo-Poveda, Antonio-
Autor(es): dc.creatorKuznetsov, Alexander S.-
Autor(es): dc.creatorBiermann, Klaus-
Autor(es): dc.creatorScalvi, Luis V.A. [UNESP]-
Autor(es): dc.creatorSantos, Paulo V.-
Data de aceite: dc.date.accessioned2022-02-22T00:23:17Z-
Data de disponibilização: dc.date.available2022-02-22T00:23:17Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-10-07-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1103/PhysRevApplied.12.044013-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198018-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198018-
Descrição: dc.descriptionCoherent superhigh-frequency (SHF) vibrations provide an excellent tool for the modulation and control of excitations in semiconductors. Here, we investigate the piezoelectric generation and propagation of longitudinal bulk acoustic waves (LBAWs) with frequencies up to 20 GHz in GaAs crystals using bulk acoustic-wave resonators (BAWRs) based on piezoelectric thin ZnO films. We show that the electroacoustic conversion efficiency of the BAWRs depends sensitively on the sputtering conditions of the ZnO films. The BAWRs are then used for the study of the propagation properties of the LBAWs in GaAs in the frequency and temperature ranges from 1 to 20 GHz and 10 and 300 K, respectively, which have so far not been experimentally accessed. We find that the acoustic absorption of GaAs in the temperature range from 80 K to 300 K is dominated by scattering with thermal phonons. In contrast, at lower temperatures, the acoustic absorption saturates at a frequency-dependent value. Experiments carried out with different propagation lengths indicate that the saturation is associated with losses during reflections at the sample boundaries. We also demonstrate devices with a high quality factor fabricated on top of acoustic Bragg reflectors. The results presented here prove the feasibility of high-quality acoustic resonators embedding GaAs-based nanostructures, thus opening the way for the modulation and control of their properties by electrically excited SHF LBAWs.-
Descrição: dc.descriptionPaul-Drude-Institut für Festkörperelektronik Leibniz-Institut im Forschungsverbund Berlin E.V., Hausvogteiplatz 5-7-
Descrição: dc.descriptionDepartment of Physics São Paulo State University (UNESP) School of Sciences Graduate Program in Materials Science and Technology (POSMAT), Av. Eng. Luiz Edmundo C. Coube 14-01-
Descrição: dc.descriptionDepartment of Physics São Paulo State University (UNESP) School of Sciences Graduate Program in Materials Science and Technology (POSMAT), Av. Eng. Luiz Edmundo C. Coube 14-01-
Idioma: dc.languageen-
Relação: dc.relationPhysical Review Applied-
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Título: dc.titleGeneration and Propagation of Superhigh-Frequency Bulk Acoustic Waves in GaAs-
Tipo de arquivo: dc.typelivro digital-
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