论文标题
在量子点中的深色电子孔对的光rocreation
Photocreation of a dark electron-hole pair in a quantum dot
论文作者
论文摘要
半导体中的光子吸收会产生明亮的激子，可将非常快速地重组到光子中。我们在这里表明，在接近P掺杂储层的量子点中，这种吸收可以产生一个黑暗的二人组，即不会发光的电子孔对。这种意外的效果依赖于以下事实：一个孔的波函数从有限级驻留点中泄漏出小于电子的波动。通过调谐现场效应设备中的施加偏置电压，这种差异可以在点中带正电的三重奏不稳定。由带正电荷的点吸收的光子吸收导致的不稳定的三重奏必须弹出其两个孔之一。剩余的二人组可以使近几个具有线性极化光子的泵送周期后的概率接近100％变成黑暗，以这种方式，可以使长寿初始状态进行量子信息处理。
Photon absorption in a semiconductor produces bright excitons that recombine very fast into photons. We here show that in a quantum dot set close to a p-doped reservoir, this absorption can produce a dark duo, i.e., an electron-hole pair that does not emit light. This unexpected effect relies on the fact that the wave function for a hole leaks out of a finite-barrier dot less than for electron. This difference can render the positively charged trio unstable in the dot by tuning the applied bias voltage in a field-effect device. The unstable trio that would result from photon absorption in a positively charged dot, has to eject one of its two holes. The remaining duo can be made dark with a probability close to 100% after a few pumping cycles with linearly polarized photons, in this way engineering long-lived initial states for quantum information processing.
