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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes
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Ultrafast Photoinduced Phase Change in SnSe.

Benjamin J Dringoli1, Mark Sutton1, Zhongzhen Luo2,3

  • 1Department of Physics, McGill University, Montreal, Quebec H3A2T8, Canada.

Physical Review Letters
|April 19, 2024
PubMed
Summary
This summary is machine-generated.

Ultrafast spectroscopy reveals a nonthermal electronic phase change in SnSe. Photoexcitation induces charge localization and band gap collapse, indicating phase segregation.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ultrafast spectroscopy

Background:

  • SnSe exhibits complex electronic properties.
  • Understanding photoinduced phase transitions is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the ultrafast electronic phase transition in SnSe.
  • To elucidate the dynamics of photoexcitation and its effect on electronic band structure.

Main Methods:

  • Time-resolved multiterahertz (THz) spectroscopy
  • Interband photoexcitation using 1.55 eV pump photons
  • Analysis of transient THz photoconductivity spectra

Main Results:

  • Observed an ultrafast, nonthermal electronic phase change in SnSe.
  • Transient THz photoconductivity spectrum showed a Lorentzian-like profile, indicating charge localization and phase segregation.
  • Photoconductivity rise was bimodal (fast and slow components) due to intervalley scattering.
  • A critical excitation fluence (~6 mJ/cm²) induced drastic changes, including macroscopic band gap collapse.

Conclusions:

  • Photoexcitation drives SnSe into a phase-segregated state.
  • The observed phenomena are attributed to interband excitation and subsequent carrier dynamics.
  • Band gap collapse at critical fluence suggests potential for novel optoelectronic devices.