Temperature dependent angular dispersions of surface acoustic waves on GaAs

Autor:	Powlowski, Mats, Sfigakis, Francois, Kim, Na Young
Rok vydání:	2021
Předmět:	Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Physics - Applied Physics
Zdroj:	Jpn. J. Apple. Phys. 58, 030907 (2019) Rapid Communication
Druh dokumentu:	Working Paper
DOI:	10.7567/1347-4065/ab0008
Popis:	We measure the phase velocities of surface acoustic waves (SAWs) propagating at different crystal orientations on (001)-cut GaAs substrates and their temperature dependance. We design and fabricate sets of interdigital transducers (IDTs) to induce 4 {\mu}m SAWs via the inverse piezoelectric (PZE) effect between the PZE [110] direction (set as {\theta} = 0{\deg}) and the non-PZE [100] direction ({\theta} = 45{\deg}) on GaAs. We also prepare ZnO film sputtered GaAs substrates in order to launch SAWs efficiently by IDTs even in the non-PZE direction. We quantify acoustic velocities between 1.4 and 300 K from the resonant frequencies in the S11 parameter using a network analyzer. We observe parabolic velocity-temperature trends at all {\theta}-values both on GaAs and ZnO/GaAs substrates. Below 200 K, in ZnO/GaAs substrates slower SAW modes appear around the [110] direction, which are unseen at RT. Comment: 7 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2105.00319 Zobrazit plný text záznamu View this record from Arxiv