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Strain-Tunable Single Photon Sources in WSe2 Monolayers.

Oliver Iff1, Davide Tedeschi2, Javier Martín-Sánchez3,4

  • 1Technische Physik and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Physikalisches Institut , Universität Würzburg , Am Hubland, D-97074 Würzburg , Germany.

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PubMed
Summary

We developed a compact device to precisely control single photon energies from 2D semiconductors using elastic strain. This method tunes emission properties reversibly without affecting single photon purity.

Keywords:
2D materialselastic strain engineeringphotoluminescencepiezoelectric devicessingle photon emitterstungsten diselenide monolayers

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Area of Science:

  • Quantum technology
  • Materials science
  • Condensed matter physics

Background:

  • Atomically thin semiconductors offer potential for ultracompact quantum devices.
  • Elastic strain engineering is a promising method for tuning material properties.
  • Single photon sources are crucial for quantum information processing.

Purpose of the Study:

  • To demonstrate a hybrid device for controlling single photon emission energy in 2D semiconductors.
  • To investigate the effects of strain on quantum emitters in wrinkled WSe2 monolayers.
  • To understand emitter-dependent strain responses for device optimization.

Main Methods:

  • Fabrication of a compact, hybrid 2D semiconductor-piezoelectric device.
  • Utilizing piezoelectric strain to tune quantum emitter energy in WSe2 monolayers.
  • Employing finite element simulations to model strain distribution and effects.

Main Results:

  • Achieved reversible tuning of localized exciton energy in WSe2 by up to 18 meV.
  • Demonstrated that single photon purity remains unaffected by strain over a wide range.
  • Observed emitter-dependent energy shifts, explained by localized strain (tensile/compressive) influenced by wrinkle topography.

Conclusions:

  • The developed device enables precise control over single photon emission energy in 2D materials.
  • Understanding emitter-specific strain responses is key for designing advanced quantum devices.
  • This work advances the practical implementation of 2D material-based single photon sources.