太赫兹辐射
拓扑(电路)
石墨烯
物理
奇点
引力奇点
光电子学
栅极电压
作者
M. Said Ergoktas,Sina Soleymani,Nurbek Kakenov,Kaiyuan Wang,Thomas B. Smith,Gokhan Bakan,Sinan Balci,Alessandro Principi,Kostya S. Novoselov,Sahin Kaya Ozdemir,Coskun Kocabas
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2022-04-08
卷期号:376 (6589): 184-188
标识
DOI:10.1126/science.abn6528
摘要
The topological structure associated with the branch point singularity around an exceptional point (EP) can provide tools for controlling the propagation of light. Through use of graphene-based devices, we demonstrate the emergence of EPs in an electrically controlled interaction between light and a collection of organic molecules in the terahertz regime at room temperature. We show that the intensity and phase of terahertz pulses can be controlled by a gate voltage, which drives the device across the EP. Our electrically tunable system allows reconstruction of the Riemann surface associated with the complex energy landscape and provides topological control of light by tuning the loss imbalance and frequency detuning of interacting modes. Our approach provides a platform for developing topological optoelectronics and studying the manifestations of EP physics in light-matter interactions.
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