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Vibrational Properties in Highly Strained Hexagonal Boron Nitride Bubbles.

Elena Blundo1, Alessandro Surrente1,2, Davide Spirito3

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|February 2, 2022
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Summary
This summary is machine-generated.

Researchers developed a hydrogen irradiation technique to create wrinkles and bubbles in hexagonal boron nitride (hBN), inducing high strain (∼2%). This method utilizes hBN

Keywords:
2D materialsRamanhBNnano-IRphononsstrain

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Area of Science:

  • Materials Science
  • Condensed Matter Physics

Background:

  • Hexagonal boron nitride (hBN) serves as a critical protective layer for atomically thin materials and heterostructures (HSs).
  • hBN is known to host quantum emitters that function at room temperature.
  • Strain significantly influences both the protective properties of hBN in HS fabrication and the electronic characteristics of quantum emitters.

Purpose of the Study:

  • To develop efficient methods for controlling and quantifying strain in hBN.
  • To investigate the role of strain in hBN for tuning quantum emitter properties.
  • To explore the potential of hBN's vibrational properties as strain sensors.

Main Methods:

  • Induction of wrinkles and bubbles in hBN via hydrogen irradiation.
  • Application of infrared (IR) near-field scanning optical microscopy.
  • Micro-Raman spectroscopy combined with numerical calculations.

Main Results:

  • Hydrogen irradiation successfully created wrinkles and bubbles in hBN, inducing strains up to approximately 2%.
  • Characterization of the strain response for both IR-active and Raman-active modes in hBN.
  • Demonstration of the high sensitivity of hBN's vibrational properties to strain.

Conclusions:

  • Hydrogen irradiation is an effective technique for generating significant strain in hBN.
  • The vibrational modes of hBN are highly sensitive probes for quantifying strain.
  • This work provides a pathway for controlling strain in hBN for advanced material applications and quantum technologies.