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Programmable Polariton Topological Insulators All-Optically Controlled by the Stark Effect.

Chuyuan Zheng1, Yanli Zhang1, Weili Zhang1

  • 1School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu611731, China.

ACS Applied Materials & Interfaces
|January 11, 2023
PubMed
Summary

We demonstrate programmable topological insulators using an all-optical method. This technique leverages the valley-selective optical Stark effect for ultrafast control of light-matter interactions in exciton-polariton systems.

Keywords:
exciton polaritonsoptical Stark effectstrong couplingtopological insulatorstransition metal dichalcogenides

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Unidirectional edge states in topological insulators are crucial for device applications.
  • Developing efficient and flexible manipulation methods for these states remains a challenge.

Purpose of the Study:

  • To propose and demonstrate an all-optical method for realizing programmable topological insulators.
  • To utilize the valley-selective optical Stark effect for precise control of topological properties.

Main Methods:

  • Fabrication of a two-dimensional honeycomb structure in an exciton-polariton platform.
  • Induction of the optical Stark effect to create a pseudo magnetic field.
  • Combination with spin-orbit coupling to form topological one-way edge states.

Main Results:

  • Demonstrated ultrafast switching speed and precise spatial controllability.
  • Showcased two applications: a tunable polariton splitter and a programmable polariton router.
  • Confirmed the designable and rewritable functionality of the all-optically controlled system.

Conclusions:

  • The proposed all-optical method enables robust and intelligent control of polariton topological insulators.
  • This approach paves the way for advanced polaritonic and spintronic devices for information processing.
  • Highlights the potential for future classical and quantum applications.