Phase behavior of coherent tunneling through a quantum dot: A consideration of the off-diagonal elastic coupling
The electron transmission amplitude through a quantum dot is studied by considering all elastic coupling elements, not only the diagonal elements Γ <Subscript> jj </Subscript>, but also the off-diagonal elements Γ <Subscript> ij </Subscript>.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 <Subscript> ij </Subscript> and k <Subscript> B </Subscript>Τ. In addition, at the phase-drop-point, some interesting manifestations are predicted. Copyright EDP Sciences, Springer-Verlag 1998
Year of publication: |
1998
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Authors: | Sun, Q. ; Lin, T. |
Published in: |
The European Physical Journal B - Condensed Matter and Complex Systems. - Springer. - Vol. 5.1998, 4, p. 913-917
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Publisher: |
Springer |
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