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Local strain engineering in atomically thin MoS2.

Andres Castellanos-Gomez1, Rafael Roldán, Emmanuele Cappelluti

  • 1Kavli Institute of Nanoscience, Delft University of Technology , Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Nano Letters
|October 3, 2013
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Summary
This summary is machine-generated.

Local strain engineering in molybdenum disulfide (MoS2) can tune its electronic band structure and optoelectronic properties. This study shows strain reduces the bandgap and guides excitons in MoS2 nanolayers.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Tailoring material properties at the nanoscale is crucial for advanced optoelectronics.
  • Atomically thin materials, like molybdenum disulfide (MoS2), offer unique possibilities for strain engineering due to their mechanical robustness.
  • Local strain can significantly alter electronic and optical characteristics.

Purpose of the Study:

  • To investigate the impact of large, localized strain on the electronic bandstructure of atomically thin MoS2.
  • To explore the potential of strain engineering for controlling optoelectronic properties in 2D materials.
  • To correlate experimental observations with theoretical modeling of strain effects.

Main Methods:

  • Photoluminescence (PL) imaging was employed to visualize strain effects in MoS2.
  • Development of a nonuniform tight-binding model to simulate electronic properties under complex strain.
  • Experimental characterization of MoS2 nanolayers subjected to localized deformations.

Main Results:

  • Observed a strain-induced reduction in the direct bandgap of MoS2.
  • Demonstrated the funneling of photogenerated excitons towards regions with higher strain.
  • Achieved good agreement between experimental PL data and theoretical bandstructure calculations.

Conclusions:

  • Local strain engineering is an effective method to control the band structure and optoelectronic behavior of MoS2.
  • The findings provide a pathway for designing nanoscale optoelectronic devices with tailored functionalities.
  • The developed tight-binding model accurately predicts the response of MoS2 to complex strain fields.