论文标题
Landau-Zener在两个量子点之间通过共振隧道耦合
Landau-Zener transition between two quantum dots coupled by resonant tunneling
论文作者
论文摘要
我们考虑电子在两个量子点之间的过渡，在两个量子点中，离散水平以恒定的速度相互扫过。如果允许在点水平之间进行直接隧穿，则当水平交叉时，将在点之间传递电子。通过常规的Landau-Zener理论描述了这种转移。我们假设禁止在点之间进行直接隧穿。相反，转移是由于通过离散的杂质水平分开的谐振隧道引起的。然后，电子传输的描述还原为三个（两个点加杂质）landau-Zener转变。过渡概率取决于谐振水平的相对位置和水平交叉的能量。这也取决于杂质和左（右）点之间隧道的左右不对称。我们计算水平（在空间）和垂直（能量）杂质水平位置的不同限制下的过渡概率。
We consider the transition of electron between two quantum dots in which the discrete levels are swept past each other with a constant velocity. If a direct tunneling between the dot levels was allowed, an electron will be transferred between the dots when the levels cross. This transfer is described in terms of the conventional Landau-Zener theory. We assume that direct tunneling between the dots is forbidden. Rather, the transfer is due to the resonant tunneling via a discrete impurity level separating the dots. Then the description of the electron transfer reduces to a threestate (two dots plus impurity) Landau-Zener transition. Transition probability depends on the relative positions of the resonant level and the energy at which the levels cross. It also depends on the left-right asymmetry of tunneling between the impurity and the left(right) dots. We calculate the transition probability in different limits of the horizontal (in space) and vertical (in energy) impurity level positions.
