NanoExcitonics: Implementing Basic Circuit Elements on 2-D Carbon System

目的：通过展示波导和门控开关两种基本功能，我们探索了基于激子的信息传输和操纵，使用高度自适应的二维单晶偏压双层石墨烯（BBG）系统，该系统在垂直电场下具有独特的可调带隙和激子结合能。目标是了解基本的激子特性，如场依赖效应，弛豫寿命操纵和工程，以及漂移迁移率，这对实现？激子的电路?。智力优势：本研究基于几个层面的创新：(1)激子波导和开关的新概念；(2)二维双层石墨烯作为材料平台；(3)通过耦合量子阱结构操纵激子寿命以产生间接激子；(4)利用局部带隙调制产生的能量梯度驱动激子的策略；(5)获取和探索带隙打开BBG系统未发现的激子特征；(6)原位测量激子迁移率的方法。更广泛的影响：这项工作旨在利用非电荷载体开发快速、高度可扩展和节能的信息传输。该研究还可能找到更广泛的应用，如高效，自适应太阳能光伏和纳米光子学。该研究为研究生和本科生提供了获得物理、光学、纳米器件、集成电路和纳米制造等多学科经验的机会。外展计划包括为K-12学生现场演示纳米科学和工程技术。通过期刊和会议出版物传播研究成果并将其纳入新课程将确保对一般公众产生广泛的科学和教育影响。

NanoExcitonics: Implementing Basic Circuit Elementson 2-D Carbon SystemObjectives: We explore exciton-based information transmission and manipulation by demonstrating two types of basic functionalities, waveguide and gate-controlled switch, using highly adaptive 2-D single-crystalline biased bilayer graphene (BBG) system that exhibits unique tunable band-gap and exciton binding energy under perpendicular electric field. The goal is to understand fundamental excitonic characteristics such as field-dependent effects, relaxation lifetime manipulation & engineering, and drift mobility which are vital to the implementation of ?excitonic circuits?. Intellectual Merits: The research is based on innovations at several levels: (1) new concepts of excitonic waveguide and switch, (2) 2-D bilayer graphene as the material platform, (3) excitonic lifetime manipulation via a coupled quantum well structure to create indirect excitons, (4) a strategy to drive excitons with energy gradient made by local band-gap modulation, (5) acquisition and exploration of undiscovered excitonic features of band-gap opened BBG system, and (6) a method to in-situ measure the exciton mobility. Broader Impact: This work aims at developing fast, highly-scalable, and energy-efficient information transmission using non-charge-based carrier. The research may also find broader applications such as highly efficient, adaptive solar photovoltaics and nanophotonics. The research opens opportunities for graduate and undergraduate students to gain multi-disciplinary experience in physics, optics, nano-devices, integrated circuits, and nanofabrication. An outreach program comprises on-site demonstration of nanoscale scientific and engineering techniques for K-12 students. The dissemination of research results by journal and conference publications and its inclusion in new curriculum developed will ensure broad scientific and educational impacts to general public community.