论文标题
兴奋剂绝缘子的第一原理对全光谱红外光电探测器的视角
First-principles perspective on full-spectrum infrared photodetectors from doping an excitonic insulator
论文作者
论文摘要
成像技术的创新涉及寻找适用于整个红外范围内检测应用的策略和材料。本文中，我们提出了一个新的设计概念，该概念是基于激子绝缘子的独特功能的，即负激子过渡能量（$ e_t $）。我们使用一维有机金属线（CRBZ）$ _ \ infty $上的第一原理$ gw $ -bse计算来证明这一概念。原始（CRBZ）$ _ \ infty $由于最低激子的负$ e_t $而表现出激子不稳定。替代掺杂可以连续调整$ e_t $从$ \ sim $ 0到$ \ sim $ 0.6 ev，这表明了从Terahertz到近红外的光子检测能力。这种类型的探测器具有出色的波长选择性，降低热干扰和工作温度升高的优点。我们的工作不仅增加了罕见的一维激发剂绝缘子家族中的另一个成员，而且为将来开发高性能红外光探测器开发了新的途径。
Innovations in imaging technology involves finding strategies and materials suitable for detection applications over the entire infrared range. Herein, we propose a new design concept based on the unique feature of an excitonic insulator, namely, negative exciton transition energy ($E_t$). We demonstrate this concept using first-principles $GW$-BSE calculations on one-dimensional organometallic wire (CrBz)$_\infty$. The pristine (CrBz)$_\infty$ exhibits an excitonic instability due to a negative $E_t$ for the lowest exciton. Substitutional doping can continuously tune the $E_t$ from $\sim$0 to $\sim$0.6 eV, which shows the ability of photon detection from terahertz to near-infrared. This type of detectors have advantages of outstanding wavelength selectivity, reduced thermal disturbance and elevated working temperature. Our work not only adds another member in the family of rare one-dimensional excitonic insulators, but also opens a new avenue for the development of high-performance infrared photodetectors in the future.
