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Dislocations as Single Photon Sources in Two-Dimensional Semiconductors.

Xiaocheng Zhou1, Zhuhua Zhang1, Wanlin Guo1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, and Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

Nano Letters
|May 27, 2020
PubMed
Summary

Topologically stable dislocations in transition metal dichalcogenide monolayers can serve as robust single photon sources. This discovery offers a stable alternative for quantum information technologies, moving beyond vulnerable traditional materials.

Keywords:
ab initio calculationdislocationsingle photon emissiontwo-dimensional transition metal dichalcogenide

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Area of Science:

  • Materials Science
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Single photon sources are crucial for quantum information technologies.
  • Current sources like atoms and quantum dots are unstable under processing.
  • Topologically stable defects offer a potential solution for device stability.

Purpose of the Study:

  • To investigate the potential of dislocations in transition metal dichalcogenide monolayers as single photon emitters.
  • To explore the tunability of emission properties based on dislocation characteristics.
  • To assess the stability and suitability of these defects for quantum applications.

Main Methods:

  • First-principles calculations were employed to determine defect levels.
  • Calculations included dipole matrix elements for optical transitions.
  • Excitation lifetimes were computed to assess emission properties.

Main Results:

  • Topologically stable dislocations were identified as viable single photon sources.
  • Emission energies are tunable from 0.48 to 1.29 eV by altering dislocation structure, charge state, and chemical composition.
  • These emission energies differ from the visible range of previously reported sources.

Conclusions:

  • Dislocations in transition metal dichalcogenide monolayers represent a novel class of stable single photon emitters.
  • The tunable emission properties and inherent stability make them promising for quantum computing.
  • This research paves the way for utilizing robust defects in next-generation quantum devices.