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Unconventional Thermophotonic Charge Density Wave.

Cheng-Long Zhou1,2, Zahra Torbatian3, Shui-Hua Yang2

  • 1School of Energy Science and Engineering, <a href="https://ror.org/01yqg2h08">Harbin Institute of Technology</a>, Harbin 150001, China.

Physical Review Letters
|August 23, 2024
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Summary
This summary is machine-generated.

We discovered a novel thermophotoconic effect in charge density wave (CDW) materials like TiSe2. This effect shows an unusual negative temperature dependence in thermal photon transport, indicating electron order changes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electronics

Background:

  • Charge-order states, such as charge density waves (CDW), significantly influence material properties but their underlying physics remain incompletely understood.
  • TiSe2 is a material known to exhibit charge density wave (CDW) states.

Purpose of the Study:

  • To investigate an unconventional thermophotoconic effect in CDW-bearing TiSe2.
  • To elucidate the interplay between plasmon polaritons and CDW electron excitations.
  • To establish a method for detecting electron order transformations.

Main Methods:

  • Combining fluctuational electrodynamics with density functional theory (DFT).
  • Analyzing thermal photon transport in CDW-bearing TiSe2.

Main Results:

  • An unconventional thermophotoconic effect, termed thermophotoconic-CDW (tp-CDW), was identified in TiSe2.
  • An anomalous negative temperature dependency in thermal photon transport was observed.
  • This dependency serves as an indicator for electron order transformation.

Conclusions:

  • The interplay of plasmon polaritons and CDW electron excitations drives the tp-CDW effect.
  • The tp-CDW transition offers potential for controllable heat flow manipulation.
  • Applications are foreseen in thermal science, electron dynamics, and energy devices.