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/content/aip/journal/jap/115/14/10.1063/1.4870712
1.
1. S. Safa, A. Asgari, and L. Faraone, J. Appl. Phys. 114, 053712 (2013).
http://dx.doi.org/10.1063/1.4817088
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2. F. Szmulowicz, H. J. Haugan, S. Elhamri, and G. J. Brown, Phys. Rev. B 84, 155307 (2011).
http://dx.doi.org/10.1103/PhysRevB.84.155307
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3. S. F. Tsay, J. C. Chiang, M. Chau, and I. Lo, Phys. Rev. B 56, 13242 (1997).
http://dx.doi.org/10.1103/PhysRevB.56.13242
http://aip.metastore.ingenta.com/content/aip/journal/jap/115/14/10.1063/1.4870712
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/content/aip/journal/jap/115/14/10.1063/1.4870712
2014-04-11
2016-09-30

Abstract

The purpose of this comment is to point out that the paper by Safa, Asgari, and Faraone [J. Appl. Phys. , 053712 (2013)] (SAF) on electronic transport in superlattices contains a number of errors in physics and execution. By dealing with a finite number of periods and forcing the wave function to be zero at the upper and lower boundaries of the superlattice stack, SAF have turned the system into a quantum well for which the momentum along the growth axis is not a good quantum number, so that the bands in the growth direction are flat and the corresponding carrier velocities and vertical mobilities are zero. A number of other errors allow the authors to get nonzero results and to reach conclusions that qualitatively mirror those of Szmulowicz, Haugan, Elhamri, and Brown [Phys. Rev. B , 155307 (2011)].

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