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Title: Topological engineering of terahertz light using electrically tunable exceptional point singularities
Authors: Ergöktaş, M. Said
Soleymani, Sina
Kakenov, Nurbek
Wang, Kaiyuan
Smith, Thomas B.
Bakan, Gökhan
Balcı, Sinan
Principi, Alessandro
Novoselov, Kostya S.
Özdemir, Şahin K.
Kocabaş, Çoşkun
University of Manchester
Pennsylvania State University
İhsan Doğramacı Bilkent Üniversitesi
University of Manchester
University of Manchester
University of Manchester
01. Izmir Institute of Technology
University of Manchester
University of Manchester
Pennsylvania State University
University of Manchester
Keywords: Exceptional point
Terahertz light
Light intensity
Electric potential
Issue Date: 2022
Publisher: American Association for the Advancement of Science
Abstract: 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.
Appears in Collections:Photonics / Fotonik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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