A graphene resonator as an ultrasound detector for generalized Love waves in a polymer film with two level states
Artikel i vetenskaplig tidskrift, 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.

graphene

LOR

two level system

shear mode

low temperatures

Love wave

Författare

Antti Laitinen

Aalto-Yliopisto

Jukka-Pekka Kaikkonen

Aalto-Yliopisto

Thanniyil S. Abhilash

Aalto-Yliopisto

Igor Todoshchenko

Aalto-Yliopisto

Juuso Manninen

Aalto-Yliopisto

Vladislav Zavyalov

Aalto-Yliopisto

Alexander Savin

Aalto-Yliopisto

Andreas Isacsson

Chalmers, Fysik, Kondenserade materiens teori

Pertti J. Hakonen

Aalto-Yliopisto

Journal of Physics D: Applied Physics

0022-3727 (ISSN)

Vol. 52 24 24LT02

Ämneskategorier

Annan materialteknik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik

DOI

10.1088/1361-6463/ab11a9

Mer information

Senast uppdaterat

2019-05-06