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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.
Original language | English |
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Article number | 24LT02 |
Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Journal of Physics D - Applied Physics |
Volume | 52 |
Issue number | 24 |
DOIs | |
Publication status | Published - 4 Apr 2019 |
MoE publication type | A1 Journal article-refereed |
Keywords
- graphene
- Love wave
- shear mode
- LOR
- low temperatures
- two level system
- TUNNELING-STATES
- GLASSES
- LAYER
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BOLOSO: Ultrasensitive bolometers for security applications
Hakonen, P., Tomi, M., Kamada, M., Manninen, J., Perelshtein, M., Zeng, W., Suresh, K., Kumar, M. & Will, M.
01/01/2018 → 31/08/2022
Project: Academy of Finland: Other research funding
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1/f noise
Hakonen, P., Will, M., Haque, M., Thanniyil Sebastian, A., Kamada, M., Sarkar, J. & Perelshtein, M.
01/09/2017 → 31/08/2021
Project: Academy of Finland: Other research funding