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Article: Carbon-nanotube-based quantum pump in the presence of a superconducting lead

TitleCarbon-nanotube-based quantum pump in the presence of a superconducting lead
Authors
KeywordsPhysics
Issue Date2002
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2002, v. 66 n. 19, p. 195419:1-8 How to Cite?
AbstractParametric electron pump through superconductor-carbon-nanotube based molecular devices was investigated. It is found that a dc current, which is assisted by resonant Andreev reflection, can be pumped out from such molecular device by a cyclic variation of two gate voltages near the nanotube. The pumped current can be either positive or negative under different system parameters. Due to the Andreev reflection, the pumped current has the double peak structure around the resonant point. The ratio of pumped current of N-SWNT-S system to that of N-SWNT-N system (INS/IN) is found to approach four in the weak pumping regime near the resonance when there is exactly one resonant level at Fermi energy inside the energy gap. Numerical results confirm that in the weak pumping regime the pumped current is proportional to the square of the pumping amplitude Vp, but in the strong pumping regime the pumped current has the linear relation with Vp. For the pumped current via two resonant levels, we found that the current reversal behavior, i.e., the direction of the current reverses when the Fermi energy is varied. This is different from the one dimensional double barrier structure. Our numerical results also predict that pumped current can be obtained more easily by using zigzag tube than by using armchair tube. We have also derived the formula for the total current in the presence of both pumping potential and external bias and applied our formula to the armchair and zigzag carbon nanotubes.
Persistent Identifierhttp://hdl.handle.net/10722/43367
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWei, Yen_HK
dc.contributor.authorWang, Jen_HK
dc.date.accessioned2007-03-23T04:44:23Z-
dc.date.available2007-03-23T04:44:23Z-
dc.date.issued2002en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2002, v. 66 n. 19, p. 195419:1-8en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43367-
dc.description.abstractParametric electron pump through superconductor-carbon-nanotube based molecular devices was investigated. It is found that a dc current, which is assisted by resonant Andreev reflection, can be pumped out from such molecular device by a cyclic variation of two gate voltages near the nanotube. The pumped current can be either positive or negative under different system parameters. Due to the Andreev reflection, the pumped current has the double peak structure around the resonant point. The ratio of pumped current of N-SWNT-S system to that of N-SWNT-N system (INS/IN) is found to approach four in the weak pumping regime near the resonance when there is exactly one resonant level at Fermi energy inside the energy gap. Numerical results confirm that in the weak pumping regime the pumped current is proportional to the square of the pumping amplitude Vp, but in the strong pumping regime the pumped current has the linear relation with Vp. For the pumped current via two resonant levels, we found that the current reversal behavior, i.e., the direction of the current reverses when the Fermi energy is varied. This is different from the one dimensional double barrier structure. Our numerical results also predict that pumped current can be obtained more easily by using zigzag tube than by using armchair tube. We have also derived the formula for the total current in the presence of both pumping potential and external bias and applied our formula to the armchair and zigzag carbon nanotubes.en_HK
dc.format.extent166367 bytes-
dc.format.extent25600 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.subjectPhysicsen_HK
dc.titleCarbon-nanotube-based quantum pump in the presence of a superconducting leaden_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=66&issue=19&spage=195419:1&epage=8&date=2002&atitle=Carbon-nanotube-based+quantum+pump+in+the+presence+of+a+superconducting+leaden_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.66.195419en_HK
dc.identifier.scopuseid_2-s2.0-37649031831-
dc.identifier.hkuros75066-
dc.identifier.isiWOS:000179677900111-

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