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Optical interband transitions in strained phosphorene.

Pham Dinh Khang1, Masoumeh Davoudiniya2, Le Thi Thu Phuong3

  • 1Laboratory of Applied Physics, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam and Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam. phamdinhkhang@tdtu.edu.vn.

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Summary
This summary is machine-generated.

Applying triaxial strain to phosphorene alters its optical conductivity by changing the band gap. Non-uniform strain uniquely causes a blue shift in optical transitions, enabling tunable optical properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Phosphorene exhibits unique electronic and optical properties.
  • Strain engineering is a key method for tuning material characteristics.
  • Understanding the impact of strain on phosphorene's optical conductivity is crucial for device applications.

Purpose of the Study:

  • To investigate the effects of triaxial strain on the interband optical conductivity (IOC) of phosphorene.
  • To analyze how strain modulus and direction influence phosphorene's electronic band structure and IOC.
  • To explore different triaxial strain configurations (uniform, in-plane uniform, non-uniform).

Main Methods:

  • Utilized a two-band Hamiltonian model.
  • Applied linear response theory and the Kubo formula.
  • Incorporated strain-dependent hopping parameters via the Harrison rule.

Main Results:

  • Triaxial strain modifies the band gap, leading to red or blue shifts in interband optical transitions.
  • Non-uniform triaxial strain consistently induces a pure blue shift, irrespective of strain magnitude or sign.
  • The study demonstrates control over edge-dependent optical responses through strain application.

Conclusions:

  • Triaxial strain is an effective tool for tuning phosphorene's optical properties.
  • Non-uniform strain offers a unique pathway for achieving specific optical shifts.
  • These findings pave the way for designing novel phosphorene-based optoelectronic devices.