Administration of EMP-related Publications
| year | 2019 |
| author(s) | A. Laitinen, J.-P. Kaikkonen, T. S. Abhilash, I. Todoshchenko, J. Manninen, V. Zavyalov, A. Savin, A. Isacsson, P. J. Hakonen |
| title | A Graphene Resonator As An Ultrasound Detector For Generalized Love Waves In A Polymer Film With Two Level States |
| document type | Paper |
| source | Journal Of Physics D: Applied Physics 52, 24LT02 (2019) |
| doi | 10.1088/1361-6463/ab11a9 |
| arxiv | https://arxiv.org/abs/1903.10345 |
| EMP/Horizon2020 | This publication does not include a EMP/Horizon2020 acknowledgement. |
| abstract | We have investigated surface shear waves at 22 MHz in a 0.5 micron thick polymer film on a SiO2/Si substrate at low temperatures using suspended and non-suspended graphene as detectors. By tracking ultrasound modes detected by oscillations of a trilayer graphene membrane both in vacuum and in helium superfluid, we assign the resonances to surface shear modes, generalized Love waves, in the resist/silicon-substrate system loaded with gold. The propagation velocity of these shear modes displays a logarithmic temperature dependence below 1 K, which is characteristic for modification of the elastic properties of a disordered solid owing to a large density of two level state systems. For the dissipation of the shear mode, we find a striking logarithmic temperature dependence, which indicates a basic relation between the speed of the surface wave propagation and the mode dissipation. |