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Article: Heat current and spin current through a carbon-nanotube-based molecular quantum pump

TitleHeat current and spin current through a carbon-nanotube-based molecular quantum pump
Authors
KeywordsPhysics
Issue Date2004
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2004, v. 70 n. 4, p. 045418:1-9 How to Cite?
AbstractWe investigate the heat current and spin current through a carbon-nanotube-based molecular quantum pump. We have derived a general expression for the heat current at finite frequency so that the heat current can be calculated order by order in pumping amplitudes. We have applied our theory to a carbon-nanotube-based quantum pump. The heat current generated during the parametric pumping has been calculated at small frequencies for finite pumping amplitude. At finite frequencies, we have calculated the heat current to the second order in pumping amplitudes. The photon assisted process is clearly observed in the heat current. In the presence of magnetic field, the carbon-nanotube-based quantum pump can function as a spin pump, a molecular device by which a dc pure spin current without accompanying charge current is generated at zero bias voltage via a cyclic deformation of two device parameters. The pure spin current is achieved when the Fermi energy is near the resonant level of the quantum pump. We find that the pure spin current is sensitive to system parameters such as pumping amplitude, external magnetic field, and gate voltage.
Persistent Identifierhttp://hdl.handle.net/10722/43428
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.authorWan, Len_HK
dc.contributor.authorWang, Ben_HK
dc.contributor.authorWang, Jen_HK
dc.date.accessioned2007-03-23T04:45:30Z-
dc.date.available2007-03-23T04:45:30Z-
dc.date.issued2004en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2004, v. 70 n. 4, p. 045418:1-9en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43428-
dc.description.abstractWe investigate the heat current and spin current through a carbon-nanotube-based molecular quantum pump. We have derived a general expression for the heat current at finite frequency so that the heat current can be calculated order by order in pumping amplitudes. We have applied our theory to a carbon-nanotube-based quantum pump. The heat current generated during the parametric pumping has been calculated at small frequencies for finite pumping amplitude. At finite frequencies, we have calculated the heat current to the second order in pumping amplitudes. The photon assisted process is clearly observed in the heat current. In the presence of magnetic field, the carbon-nanotube-based quantum pump can function as a spin pump, a molecular device by which a dc pure spin current without accompanying charge current is generated at zero bias voltage via a cyclic deformation of two device parameters. The pure spin current is achieved when the Fermi energy is near the resonant level of the quantum pump. We find that the pure spin current is sensitive to system parameters such as pumping amplitude, external magnetic field, and gate voltage.en_HK
dc.format.extent143255 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.titleHeat current and spin current through a carbon-nanotube-based molecular quantum pumpen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=70&issue=4&spage=045418:1&epage=9&date=2004&atitle=Heat+current+and+spin+current+through+a+carbon-nanotube-based+molecular+quantum+pumpen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.70.045418en_HK
dc.identifier.scopuseid_2-s2.0-37649032183-
dc.identifier.hkuros92000-
dc.identifier.isiWOS:000223053300068-
dc.identifier.citeulike5904473-

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