Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/91723
Title: Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass
Authors: Sethna, James. P.
Jacobsen, K. W.
Myers, Christopher R.
Ralph, Daniel C.
Vegge, Tejs
Cheong, Siew Ann
Keywords: DRNTU::Science::Physics::Atomic physics::Solid state physics
Issue Date: 2001
Source: 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.
Series/Report no.: Physical review letters
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.
URI: https://hdl.handle.net/10356/91723
http://hdl.handle.net/10220/4592
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.86.1546
Rights: Physical Review Letters. © 2001 The American Physical Society. The journal's website is located at http://www.aps.org/
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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