The meaning of group delay in barrier tunnelling: a re-examination of superluminal group velocities

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dc.contributor.author Winful, Herbert G. en_US
dc.date.accessioned 2006-12-19T19:10:50Z
dc.date.available 2006-12-19T19:10:50Z
dc.date.issued 2006-06-01 en_US
dc.identifier.citation Winful, Herbert G (2006). "The meaning of group delay in barrier tunnelling: a re-examination of superluminal group velocities." New Journal of Physics. 8(6): 101. <http://hdl.handle.net/2027.42/49056> en_US
dc.identifier.issn 1367-2630 en_US
dc.identifier.uri http://hdl.handle.net/2027.42/49056
dc.description.abstract We show that the group delay in tunnelling is not a traversal time but a lifetime of stored energy or stored probability escaping through both ends of the barrier. Because it is a lifetime associated with both forward (transmitted) and backward (reflected) fluxes, it cannot be used to define a group velocity for forward transit in cases where a wavepacket is mostly reflected. For photonic tunnelling barriers the group delay is identical to the dwell time which is also a property of an entire wavefunction with reflected and transmitted components. Theoretical predictions and experimental reports of superluminal group velocities in barrier tunnelling are re-interpreted. en_US
dc.format.extent 3118 bytes
dc.format.extent 389437 bytes
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher IOP Publishing Ltd en_US
dc.title The meaning of group delay in barrier tunnelling: a re-examination of superluminal group velocities en_US
dc.type Article en_US
dc.subject.hlbsecondlevel Physics en_US
dc.subject.hlbtoplevel Science en_US
dc.description.peerreviewed Peer Reviewed en_US
dc.contributor.affiliationum Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, MI 48109-2122, USA en_US
dc.contributor.affiliationumcampus Ann Arbor en_US
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/49056/2/njp6_6_101.pdf en_US
dc.identifier.doi http://dx.doi.org/10.1088/1367-2630/8/6/101 en_US
dc.identifier.source New Journal of Physics. en_US
dc.owningcollname Interdisciplinary and Peer-Reviewed
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