Macroscopic quantum tunneling in nanoelectromechanical systems
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© 2011 American Physical Society (APS). This is the accepted version of the following article: 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, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.84.195433.
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Date
2011
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Mcode
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Language
en
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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
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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.