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Article: Focusing of electron flow in a bipolar graphene ribbon with different chiralities

TitleFocusing of electron flow in a bipolar graphene ribbon with different chiralities
Authors
KeywordsPhysics
Issue Date2010
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2010, v. 81 n. 16 article no. 165425 How to Cite?
AbstractThe focusing of electron flow in a symmetric p-n junction (PNJ) of graphene ribbon with different chiralities is studied. Considering the PNJ with the sharp interface, in a armchair ribbon, the electron flow emitting from (−L,0) in n region can always be focused perfectly at (L,0) in p region in the whole Dirac fermion regime, i.e., in whole regime E0
Persistent Identifierhttp://hdl.handle.net/10722/123856
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
Government of HKSARHKU 704308P
NSF-China10734110
10821403
10974236
Funding Information:

We gratefully acknowledge the financial support by a RGC Grant (Grant No. HKU 704308P) from the Government of HKSAR and NSF-China under Grants No. 10734110, No. 10821403, and No. 10974236.

Grants

 

DC FieldValueLanguage
dc.contributor.authorXing, Y-
dc.contributor.authorWang, J-
dc.contributor.authorSun, QF-
dc.date.accessioned2010-10-05T03:56:38Z-
dc.date.available2010-10-05T03:56:38Z-
dc.date.issued2010-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2010, v. 81 n. 16 article no. 165425-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/123856-
dc.description.abstractThe focusing of electron flow in a symmetric p-n junction (PNJ) of graphene ribbon with different chiralities is studied. Considering the PNJ with the sharp interface, in a armchair ribbon, the electron flow emitting from (−L,0) in n region can always be focused perfectly at (L,0) in p region in the whole Dirac fermion regime, i.e., in whole regime E0<t, where E0 is the distance between Dirac-point energy and Fermi energy and t is the nearest hopping energy. For the bipolar ribbon with zigzag edge, however, the incoming electron flow in n region is perfectly converged in p region only in a very low energy regime with E0<0.05t. Moreover, for a smooth PNJ, electrons are backscattered near PNJ, which weakens the focusing effect. But the focusing pattern still remains the same as that of the sharp PNJ. In addition, quantum oscillation in charge density occurs due to the interference between forward and backward scatterings. Finally, in the presence of weak perpendicular magnetic field, charge carriers are deflected in opposite directions in the p region and n region. As a result, the focusing effect is smeared. The lower the energy E0, the easier the focusing effect is destroyed. For the high-energy E0 (e.g., E0=0.9t), however, the focusing effect can still survive in a moderate magnetic field on order of 1 T.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/-
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.-
dc.subjectPhysics-
dc.titleFocusing of electron flow in a bipolar graphene ribbon with different chiralitiesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=81&issue=16&spage=165425&epage=&date=2010&atitle=Focusing+of+electron+flow+in+a+bipolar+graphene+ribbon+with+different+chiralities-
dc.identifier.emailXing, Y: xyx@aphy.iphy.ac.cn-
dc.identifier.emailWang, J: jianwang@hkusub.hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.81.165425-
dc.identifier.scopuseid_2-s2.0-77955409157-
dc.identifier.hkuros170795-
dc.identifier.volume81-
dc.identifier.issue16 article no. 165425-
dc.identifier.isiWOS:000277217200102-
dc.relation.projectThe first principle study of local heating and heat transport in nano-devices-

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