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Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass

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Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass

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dc.contributor.author Vegge, Tejs
dc.contributor.author Sethna, James. P.
dc.contributor.author Cheong, Siew Ann
dc.contributor.author Jacobsen, K. W.
dc.contributor.author Myers, Christopher R.
dc.contributor.author Ralph, Daniel C.
dc.date.accessioned 2009-05-06T04:11:02Z
dc.date.available 2009-05-06T04:11:02Z
dc.date.copyright 2001
dc.date.issued 2009-05-06T04:11:02Z
dc.identifier.citation Vegge, T., Sethna, J. P., Cheong, S. A., Jacobsen, K. W., Myers, C. R., & Ralph, D. C. (2001). Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass. Physical Review Letters, 86(8), 1546-1549.
dc.identifier.issn 0031-9007
dc.identifier.uri http://hdl.handle.net/10220/4592
dc.description.abstract Several experiments indicate that there are atomic tunneling defects in plastically deformed metals. How this is possible has not been clear, given the large mass of the metal atoms. Using a classical molecular-dynamics calculation, we determine the structures, energy barriers, effective masses, and quantum tunneling rates for dislocation kinks and jogs in copper screw dislocations. We find that jogs are unlikely to tunnel, but the kinks should have large quantum fluctuations. The kink motion involves hundreds of atoms each shifting a tiny amount, leading to a small effective mass and tunneling barrier.
dc.format.extent 4 p.
dc.language.iso en
dc.relation.ispartofseries Physical review letters
dc.rights Physical Review Letters. © 2001 The American Physical Society. The journal's website is located at http://www.aps.org/
dc.subject DRNTU::Science::Physics::Atomic physics::Solid state physics
dc.title Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass
dc.type Journal Article
dc.identifier.openurl http://sfxna09.hosted.exlibrisgroup.com:3410/ntu/sfxlcl3?sid=metalib:CSA_MEDLINE&id=doi:&genre=&isbn=&issn=0031-9007&date=2001&volume=86&issue=8&spage=1546&epage=9&aulast=Vegge&aufirst=%20T&auinit=&title=Physical%20review%20letters&atitle=Calculation%20of%20quantum%20tunneling%20for%20a%20spatially%20extended%20defect%3A%20the%20dislocation%20kink%20in%20copper%20has%20a%20low%20effective%20mass%2E
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevLett.86.1546
dc.description.version Published version

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