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Resonant states and transmission coefficient oscillations for potential wells and barriers

Publication Type : Journal Article

Publisher : American Journal of Physics, AAPT,

Source : American Journal of Physics, AAPT, Volume 78, Number 4, p.412–417 (2010)

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Campus : Coimbatore

School : School of Engineering

Department : Sciences

Year : 2010

Abstract : The oscillatory behavior of the transmission coefficient TT as a function of energy is examined for an attractive square well and a rectangular barrier. We calculate TT using resonant state boundary conditions and demonstrate that the maxima in TT are correlated with the broad resonances generated by these potentials. For barrier potentials the maxima signify resonances occurring at energies above the barrier height. It is shown that the resonance position and width can also be generated from the complex poles of the amplitude of the transmitted plane wave. We also explain the relation between the positions of the resonances generated by the square well and the rectangular barrier to the energy eigenvalues of the corresponding rigid box with the same range. We show for a potential with an attractive well and a repulsive barrier that TT exhibits oscillations when the particle energy is below the barrier, implying that in many cases the simple WKB type barrier penetration expression for TT is not adequate. These features of TT are likely to hold for most attractive potentials and flat repulsive barriers. We also discuss the attractive modified Poschl–Teller type potential for which TT does not show oscillations as a function of energy.

Cite this Research Publication : Dr. Umamaheswari A., Prema, P., and Shastry, C. S., “Resonant states and transmission coefficient oscillations for potential wells and barriers”, American Journal of Physics, vol. 78, pp. 412–417, 2010.

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