论文标题
石墨烯量子点在库仑阻滞状态下的超敏感响应到THZ辐射
Ultrasensitive Photoresponse of Graphene Quantum Dot in the Coulomb Blockade Regime to THz Radiation
论文作者
论文摘要
石墨烯量子点（GQD）最近引起了广泛的关注，对Terahertz（THZ）技术具有吸引力。这包括通过THZ辐射照明时GQD中大型热辐射效应的演示。但是，THz光子与库仑阻滞状态中的GQD的相互作用 - 单电子传输方式 - 尚未探索。在这里，我们在低温（170 mk）的库仑封锁状态下，在库仑封锁状态下，对Thz辐射的超敏感响应（从<0.1至10 THz）。我们表明，$ \ sim $ 10 PW的Thz辐射在纳米接管范围内提供了光电流响应，这是由于GQD的化学电位的重新归一化$ \ sim $ \ sim $ 0.15 meV。我们将这种光响应归因于界面的光子效应。此外，我们的分析揭示了没有热效应的缺乏，在GQDS中THZ频率的相干量子效应的研究中开了新方向。
Graphene quantum dots (GQDs) have recently attracted considerable attention, with appealing properties for terahertz (THz) technology. This includes the demonstration of large thermal bolometric effects in GQDs when illuminated by THz radiation. However, the interaction of THz photons with GQDs in the Coulomb blockade regime - single electron transport regime - remains unexplored. Here, we demonstrate the ultrasensitive photoresponse to THz radiation (from <0.1 to 10 THz) of a hBN-encapsulated GQD in the Coulomb blockade regime at low temperature (170 mK). We show that THz radiation of $\sim$10 pW provides a photocurrent response in the nanoampere range, resulting from a renormalization of the chemical potential of the GQD of $\sim$0.15 meV. We attribute this photoresponse to an interfacial photogating effect. Furthermore, our analysis reveals the absence of thermal effects, opening new directions in the study of coherent quantum effects at THz frequencies in GQDs.
