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Phase behavior of coherent tunneling through a quantum dot: A consideration of the off-diagonal elastic coupling

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  • Q. Sun
  • T. Lin

Abstract

The electron transmission amplitude through a quantum dot is studied by considering all elastic coupling elements, not only the diagonal elements Γ jj , but also the off-diagonal elements Γ ij .The Breit-Winger formula is extended to multiple states under the above consideration. The phase of the transmission amplitude exhibits a gradual increase by π along a resonance peak and an abrupt phase drop by π near the center between two consecutive resonance peaks which can be explained completely in a single-electron picture. When the temperature Τ=0 the phase drop is absolutely abrupt; when Τ≠0 the phase drop is on a energy scale much smaller than both Γ ij and k B Τ. In addition, at the phase-drop-point, some interesting manifestations are predicted. Copyright EDP Sciences, Springer-Verlag 1998

Suggested Citation

  • Q. Sun & T. Lin, 1998. "Phase behavior of coherent tunneling through a quantum dot: A consideration of the off-diagonal elastic coupling," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 5(4), pages 913-917, November.
    • Handle: RePEc:spr:eurphb:v:5:y:1998:i:4:p:913-917:10.1007/s100510050517
    DOI: 10.1007/s100510050517
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