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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Chalmers University of Technology

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.

Details

Original languageEnglish
Article number24LT02
Pages (from-to)1-7
Number of pages7
JournalJournal of Physics D - Applied Physics
Volume52
Issue number24
Publication statusPublished - 4 Apr 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • graphene, Love wave, shear mode, LOR, low temperatures, two level system, TUNNELING-STATES, GLASSES, LAYER

ID: 33291329