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Dramatic Plasmon Response to the Charge-Density-Wave Gap Development in 1T-TiSe_{2}.

Zijian Lin^1,2, Cuixiang Wang^1,2, A Balassis³

¹Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

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Summary

1T-TiSe2 exhibits charge density wave (CDW) properties. This study reveals plasmon damping mechanisms, challenging exciton insulator theories and highlighting plasmon tunability in CDW materials.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

1T-TiSe2 is a prominent charge density wave (CDW) material.
It is considered a candidate for exciton insulator behavior, suggested by plasmon softening.
Understanding its electronic properties is key to exploring novel quantum phenomena.

Purpose of the Study:

To investigate the temperature-dependent plasmon behavior in 1T-TiSe2.
To clarify the role of plasmons in the CDW transition and exciton condensation.
To determine the damping mechanisms of plasmons in this material.

Main Methods:

High-resolution electron energy loss spectroscopy (HREELS).
Systematic temperature-dependent measurements.
Analysis of plasmon and phonon modes.

Main Results:

Plasmon and phonon modes were clearly resolved.
Landau damping of plasmons at finite momentums was observed, refuting plasmon softening for exciton condensation.
Plasmon lifetime at zero momentum showed strong correlation with band gap evolution during the CDW transition.
Interband transitions near the Fermi level act as a significant plasmon damping channel in the normal phase, suppressed in the CDW phase.

Conclusions:

The findings do not support the exciton condensation picture based on plasmon softening in 1T-TiSe2.
Plasmon damping is strongly influenced by the opening of the CDW gap.
This work reveals significant tunability of plasmons in semimetals and small-gap semiconductors like 1T-TiSe2.