论文标题
电子 - 光子的耦合强度和光子 - 环境相互作用对电子传输通过光子腔中的双量子点系统的多共振的影响
Effects of coupling strength of the electron-photon and the photon-environment interactions on the electron transport through multiple-resonances of a double quantum dot system in a photon cavity
论文作者
论文摘要
我们通过双量子点(DQD)系统研究电子传输性能,该系统耦合到单个模式光子腔,DQD-cavity。 DQD系统具有复杂的多级能谱,其中通过调谐DQD系统的电子状态和光子装扮状态的光子能量几种反划入,这在简单的两个级别DQD系统中尚未看到。基于反杂交研究光子能的三个不同区域,其中光子能量范围被归类为“低”,“中间”和“高”。抗交叉代表多种rabi-onsonans,这导致“中间”光子能的电子传输中电流倾斜。提高电子 - 光子耦合强度,$g_γ$,抗横断状态之间的光子交换发生了变化,导致多个RABI共振状态的脱位。因此,进一步降低了中间光子能量的电流倾角。此外,我们调整了腔体环境耦合$κ$,以了解强耦合方案中的传输属性如何在光子极化的不同方向上更改。增加$κ$,恒定值为$g_γ$,发现了中间光子能量的电流增强,并且对于“高”光子能量范围而言,电流的降低。中间光子能的当前增强是由于系统中多重rabi谐振的削弱引起的。
We study electron transport properties through a double quantum dot (DQD) system coupled to a single mode photon cavity, DQD-cavity. The DQD system has a complex multilevel energy spectrum, in which by tuning the photon energy several anti-crossings between the electron states of the DQD system and photon dressed states are produced, which have not been seen in a simple two level DQD system. Three different regions of the photon energy are studied based on anti-crossings, where the photon energy ranges are classified as "low", "intermediate", and "high". The anti-crossings represent multiple Rabi-resonances, which lead to a current dip in the electron transport at the "intermediate" photon energy. Increasing the electron-photon coupling strength, $g_γ$, the photon exchanges between the anti-crossing states are changed leading to a dislocation of the multiple Rabi resonance states. Consequently, the current dip at the intermediate photon energy is further reduced. Additionally, we tune the cavity-environment coupling, $κ$, to see how the transport properties in the strong coupling regime, g$_γ>κ$, are changed for different directions of the photon polarization. Increasing $κ$ with a constant value of $g_γ$, a current enhancement in the intermediate photon energy is found, and a reduction in the current is seen for the "high" photon energy range. The current enhancement in the intermediate photon energy is caused by the weakening of the multiple Rabi-resonance in the system.