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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spectroscopy

Background:

  • Studying materials under extreme pressure using diamond anvil cells (DACs) is crucial for discovering new states of matter.
  • Direct measurement of electronic structure within DACs remains a significant challenge.
  • Solid-state high-harmonic generation (sHHG) provides an all-optical method to probe material electronic structures.

Purpose of the Study:

  • To demonstrate the capability of sHHG spectroscopy for probing electronic structure under high pressure within a DAC.
  • To investigate pressure-induced electronic transitions in 2H-molybdenum disulfide (MoS2).

Main Methods:

  • Utilized solid-state high-harmonic generation (sHHG) spectroscopy.
  • Employed diamond anvil cells (DACs) to achieve pressures up to 30 GPa.
  • Performed first-principles simulations to interpret experimental observations.

Main Results:

  • Observed a pressure-induced crossover of the lowest direct bandgap in 2H-MoS2 from the K-point to the [Formula: see text]-point.
  • Detected a sharp minimum in harmonic intensity and a 30° rotation of sHHG polarization anisotropy.
  • Confirmed these electronic transitions occurred without a structural phase change.

Conclusions:

  • sHHG spectroscopy is established as a sensitive probe for electronic transitions at high pressures.
  • This technique enables the study of quantum phenomena previously inaccessible with conventional methods.
  • The findings provide new insights into the electronic behavior of materials under extreme conditions.