A graphene resonator as an ultrasound detector for generalized Love waves in a polymer film with two level states
Journal article, 2019

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.

LOR

low temperatures

graphene

two level system

Love wave

shear mode

Author

Antti Laitinen

Aalto University

Jukka-Pekka Kaikkonen

Aalto University

Thanniyil S. Abhilash

Aalto University

Igor Todoshchenko

Aalto University

Juuso Manninen

Aalto University

Vladislav Zavyalov

Aalto University

Alexander Savin

Aalto University

Andreas Isacsson

Chalmers, Physics, Condensed Matter Theory

Pertti J. Hakonen

Aalto University

Journal of Physics D: Applied Physics

0022-3727 (ISSN)

Vol. 52 24 24LT02

Subject Categories

Other Materials Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

Condensed Matter Physics

DOI

10.1088/1361-6463/ab11a9

More information

Latest update

10/3/2019