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Observation of chiral state transfer without encircling an exceptional point.
Nasari, Hadiseh; Lopez-Galmiche, Gisela; Lopez-Aviles, Helena E; Schumer, Alexander; Hassan, Absar U; Zhong, Qi; Rotter, Stefan; LiKamWa, Patrick; Christodoulides, Demetrios N; Khajavikhan, Mercedeh.
Afiliación
  • Nasari H; Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, USA.
  • Lopez-Galmiche G; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
  • Lopez-Aviles HE; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
  • Schumer A; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
  • Hassan AU; Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, USA.
  • Zhong Q; Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna, Austria.
  • Rotter S; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
  • LiKamWa P; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
  • Christodoulides DN; Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna, Austria.
  • Khajavikhan M; CREOL, The College of Optics & Photonics, University of Central Florida, Orlando, FL, USA.
Nature ; 605(7909): 256-261, 2022 05.
Article en En | MEDLINE | ID: mdl-35546193
The adiabatic theorem, a corollary of the Schrödinger equation, manifests itself in a profoundly different way in non-Hermitian arrangements, resulting in counterintuitive state transfer schemes that have no counterpart in closed quantum systems. In particular, the dynamical encirclement of exceptional points (EPs) in parameter space has been shown to lead to a chiral phase accumulation, non-adiabatic jumps and topological mode conversion1-8. Recent theoretical studies, however, have shown that contrary to previously established demonstrations, this behaviour is not strictly a result of winding around a non-Hermitian degeneracy9. Instead, it seems to be mostly attributed to the non-trivial landscape of the Riemann surfaces, sometimes because of the presence of an EP in the vicinity9-11. Here, in an effort to bring this counterintuitive aspect of non-Hermitian systems to light and confirm this hypothesis, we provide a set of experiments to directly observe the field evolution and chiral state conversion in an EP-excluding cycle in a slowly varying non-Hermitian system. To do so, a versatile yet unique fibre-based photonic emulator is realized that utilizes the polarization degrees of freedom in a quasi-common-path single-ring arrangement. Our observations may open up new avenues for light manipulation and state conversion, as well as providing a foundation for understanding the intricacies of the adiabatic theorem in non-Hermitian systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Nature Año: 2022 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido