Heat-to-mechanical energy conversion in graphene: Manifestation of Umklapp enhancement with strain
Artikel i vetenskaplig tidskrift, 2019

Conversion of heat-flux from a steady state temperature difference to mechanical vibration is demonstrated in graphene nanoribbons using direct non-equilibrium molecular dynamics. We observe that this effect is independent of the method of imposing the temperature gradient, heat flux, as well as imposed boundary conditions. We propose that simply dividing the nanoribbon in long and short sections using a partially immobilized area will lead to excitation of long-wavelength vibrations into the long section of the nanoribbon. This results in simpler architectures for heat-to-vibration converter devices based on graphene. Furthermore, we observe that applying tensile axial strain to nanoribbons facilitates vibrational instability by reducing the required threshold heat flux or the temperature gradient. Finally, we discuss the role played by Umklapp scattering for physical mechanisms behind these observations.

Författare

Daryoush Shiri

Chalmers, Fysik, Kondenserade materiens teori

Andreas Isacsson

Chalmers, Fysik, Kondenserade materiens teori

Journal of Applied Physics

0021-8979 (ISSN) 1089-7550 (eISSN)

Vol. 125 125101

Styrkeområden

Nanovetenskap och nanoteknik (2010-2017)

Materialvetenskap

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Annan fysik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik

DOI

10.1063/1.5081902

Mer information

Skapat

2019-03-22