Macroscopic quantum tunneling in nanoelectromechanical systems

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2011
Major/Subject
Mcode
Degree programme
Language
en
Pages
195433/1-7
Series
Physical Review B, Volume 84, Issue 19
Abstract
The experimental observation of quantum phenomena in mechanical degrees of freedom is difficult, as the systems become linear toward low energies and the quantum limit, and thus reside in the correspondence limit. Here we investigate how to access quantum phenomena in flexural nanomechanical systems which are strongly deflected by a voltage. Near a metastable point one can achieve a significant nonlinearity in the electromechanical potential at the scale of zero-point energy. The system can then escape from the metastable state via macroscopic quantum tunneling (MQT). We consider two model systems suspended atop a voltage gate, namely, a graphene sheet and a carbon nanotube. We find that the experimental demonstration of the phenomenon is currently possible but demanding, since the MQT crossover temperatures fall in the milli-Kelvin range. A carbon nanotube is suggested as the most promising system.
Description
Keywords
quantum phenomenas, graphene, carbon nanotubes
Other note
Citation
Sillanpää, Mika A. & Khan, Raphaël & Heikkilä, Tero T. & Hakonen, Pertti J.. 2011. Macroscopic quantum tunneling in nanoelectromechanical systems. Physical Review B. Volume 84, Issue 19. 195433/1-7. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.84.195433.