Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-02-27
Phys. Rev. B 75, 125308 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 4 figures, accepted for publication in Phys. Rev. B
Scientific paper
The response of a quantum dot coupled with one normal lead and a superconductor lead driven by a step-like pulse bias $V_L$ is studied using the non-equilibrium Green function method. In the linear pulse bias regime, the responses of the upwards and downwards bias are symmetric. In this regime the turn-on time and turn-off time are much slower than that of the normal system due to the Andreev reflection. On the other hand, for the large pulse bias $V_L$, the instantaneous current exhibits oscillatory behaviors with the frequency $\hbar\Omega =qV_L$. The turn on/off times are in (or shorter than) the scale of $1/V_L$, so they are faster for the larger bias $V_L$. In addition, the responses for the upwards and downwards bias are asymmetric at large $V_L$. The turn-on time is larger than the turn-off time but the relaxation time \cite{note1} depends only on the coupling strength $\Gamma$ and it is much smaller than the turn-on/off times for the large bias $V_L$.
Sun Qing-feng
Wang Jian
Xing Yanxia
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