Electromagnetic Saturation of Angstrom-Sized Quantum Barriers at Terahertz Frequencies

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Metal-graphene-metal hybrid structures allow angstrom-scale van derWaals gaps, across which electron tunneling occurs. We squeeze terahertz electromagnetic waves through these lambda/10000000 gaps, accompanied by giant field enhancements. Unprecedented transmission reduction of 97% is achieved with the transient voltage across the gap saturating at 5 V. Electron tunneling facilitated by the transient electric field strongly modifies the gap index, starting a self-limiting process related to the barrier height. Our work enables greater interplay between classical optics and quantum tunneling, and provides optical indices to the van der Waals gaps
Publisher
AMER PHYSICAL SOC
Issue Date
2015-09
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.115, no.12, pp.125501

ISSN
0031-9007
DOI
10.1103/PhysRevLett.115.125501
URI
http://hdl.handle.net/10203/212659
Appears in Collection
PH-Journal Papers(저널논문)
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