A graphene resonator as an ultrasound detector for generalized Love waves in a polymer film with two level states
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-04-04
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en
Pages
7
1-7
1-7
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Journal of Physics D - Applied Physics, Volume 52, issue 24
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.Description
| openaire: EC/H2020/824109/EU//EMP
Keywords
graphene, Love wave, shear mode, LOR, low temperatures, two level system, TUNNELING-STATES, GLASSES, LAYER
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Citation
Laitinen, A, Kaikkonen, J-P, Abhilash, T S, Todoshchenko, I, Manninen, J, Zavyalov, V, Savin, A, Isacsson, A & Hakonen, P J 2019, ' A graphene resonator as an ultrasound detector for generalized Love waves in a polymer film with two level states ', Journal of Physics D - Applied Physics, vol. 52, no. 24, 24LT02, pp. 1-7 . https://doi.org/10.1088/1361-6463/ab11a9