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      Topological engineering of terahertz light using electrically tunable exceptional point singularities

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      Author(s)
      Ergoktas, M. Said
      Soleymani, Sina
      Kakenov, Nurbek
      Wang, Kaiyuan
      Smith, Thomas B.
      Bakan, Gokhan
      Balci, Sinan
      Principi, Alessandro
      Novoselov, Kostya S.
      Ozdemir, Sahin K.
      Kocabas, Coskun
      Date
      2022
      Source Title
      Science
      Print ISSN
      0036-8075
      Electronic ISSN
      1095-9203
      Publisher
      American Association for the Advancement of Science (AAAS)
      Volume
      376
      Issue
      6589
      Pages
      184 - 188
      Language
      English
      Type
      Article
      Item Usage Stats
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      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.
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      http://hdl.handle.net/11693/111623
      Published Version (Please cite this version)
      https://www.doi.org/10.1126/science.abn6528
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