Spontaneous symmetry breaking in two coupled nanomechanical electron shuttles

Title
Spontaneous symmetry breaking in two coupled nanomechanical electron shuttles
Authors
김철기박종후Robert H. Blick
Keywords
spontaneous symmetry breaking; nanomechanical; electron shuttle
Issue Date
2010-08
Publisher
Physical review letters
Citation
VOL 105, NO 6-067204-4
Abstract
We present spontaneous symmetry breaking in a nanoscale version of a setup prolific in classical mechanics: two coupled nanomechanical pendula. The two pendula are electron shuttles fabricated as nanopillars [D. V. Scheible and R. H. Blick, Appl. Phys. Lett. 84, 4632 (2004).] and placed between two capacitor plates in a homogeneous electric field. Instead of being mechanically coupled through a spring they exchange electrons, i.e., they shuttle electrons from the source to the drain "capacitor plate.'' The nonzero dc current through this system by external ac excitation is caused via dynamical symmetry breaking. This symmetry-broken current appears at sub- and superharmonics of the fundamental mode of the coupled system.
URI
http://pubs.kist.re.kr/handle/201004/66046
ISSN
0031-9007
Appears in Collections:
KIST Publication > Article
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