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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Plasmon-Phonon Hybridization in Doped Semiconductors from First Principles.

Jae-Mo Lihm1, Cheol-Hwan Park1

  • 1Department of Physics and Astronomy, <a href="https://ror.org/04h9pn542">Seoul National University</a>, Seoul 08826, Korea; Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea and Center for Theoretical Physics, <a href="https://ror.org/04h9pn542">Seoul National University</a>, Seoul 08826, Korea.

Physical Review Letters
|September 27, 2024
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Summary
This summary is machine-generated.

This study investigates the nonadiabatic hybridization of plasmons and phonons in doped semiconductors. First-principles calculations reveal their mutual screening, offering new insights into semiconductor physics.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Plasmons and phonons are key low-energy excitations in doped semiconductors.
  • Their nonadiabatic hybridization and mutual screening are crucial but not fully understood from first principles.

Purpose of the Study:

  • To investigate the nonadiabatic hybridization and mutual screening of plasmons and phonons in doped semiconductors from first principles.
  • To develop a theoretical framework for studying these coupled excitations.

Main Methods:

  • Transformation of the Dyson equation to a frequency-independent dynamical matrix.
  • Modeling an equivalent damped oscillator system.
  • First-principles calculations for doped Gallium Arsenide (GaAs) and Titanium Dioxide (TiO2).

Main Results:

  • The study successfully models the nonadiabatic hybridization and mutual screening of plasmons and phonons.
  • Calculations for doped GaAs and TiO2 show good agreement with existing Raman spectroscopy data.

Conclusions:

  • The developed theoretical approach provides a robust method for studying coupled plasmon-phonon dynamics.
  • Experimental validation is expected from infrared, neutron, electron-energy-loss, and angle-resolved photoemission spectroscopies.