Influence of nitrogen on coherent longitudinal optical phonons in GaAs1−xNx

Hideo Takeuchi; Kai Matsunaga; Yusuke Sengi; Jared W. Mitchell; Yury Turkulets; Rachel S. Goldman

doi:10.1063/5.0307567

Influence of nitrogen on coherent longitudinal optical phonons in GaAs_1−xN_x

Hideo Takeuchi
, Kai Matsunaga
, Yusuke Sengi
, Jared W. Mitchell
, Yury Turkulets
, Rachel S. Goldman

Research output: Contribution to journal › Article › peer-review

Abstract

We investigated the influence of nitrogen (N) on coherent longitudinal optical (LO) phonons in dilute nitride semiconductor alloys. Terahertz time-domain spectroscopy reveals a reduced frequency (redshift) of LO phonons and enhanced decay times for coherent GaAs-like LO phonons emitted from GaAs_1−xN_x in comparison to those from semi-insulating GaAs. We attribute the redshift of the phonon frequency to both N-alloying-induced compression of the As-sublattice and tensile coherency strain at the GaAs_1−xN_x/GaAs interface. In addition, an N-induced enhancement of the coherent phonon decay time is attributed to reduced LO phonon scattering associated with the enhanced electron effective masses that reduce the transient electron velocity.

Original language	English
Article number	233105
Journal	Journal of Applied Physics
Volume	138
Issue number	23
DOIs	https://doi.org/10.1063/5.0307567
State	Published - 21 Dec 2025
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Physics and Astronomy (miscellaneous)
General Physics and Astronomy

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10.1063/5.0307567

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title = "Influence of nitrogen on coherent longitudinal optical phonons in GaAs1−xNx",

abstract = "We investigated the influence of nitrogen (N) on coherent longitudinal optical (LO) phonons in dilute nitride semiconductor alloys. Terahertz time-domain spectroscopy reveals a reduced frequency (redshift) of LO phonons and enhanced decay times for coherent GaAs-like LO phonons emitted from GaAs1−x Nx in comparison to those from semi-insulating GaAs. We attribute the redshift of the phonon frequency to both N-alloying-induced compression of the As-sublattice and tensile coherency strain at the GaAs1−x Nx/GaAs interface. In addition, an N-induced enhancement of the coherent phonon decay time is attributed to reduced LO phonon scattering associated with the enhanced electron effective masses that reduce the transient electron velocity.",

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T1 - Influence of nitrogen on coherent longitudinal optical phonons in GaAs1−xNx

AU - Takeuchi, Hideo

AU - Matsunaga, Kai

AU - Sengi, Yusuke

AU - Mitchell, Jared W.

AU - Turkulets, Yury

AU - Goldman, Rachel S.

PY - 2025/12/21

Y1 - 2025/12/21

N2 - We investigated the influence of nitrogen (N) on coherent longitudinal optical (LO) phonons in dilute nitride semiconductor alloys. Terahertz time-domain spectroscopy reveals a reduced frequency (redshift) of LO phonons and enhanced decay times for coherent GaAs-like LO phonons emitted from GaAs1−x Nx in comparison to those from semi-insulating GaAs. We attribute the redshift of the phonon frequency to both N-alloying-induced compression of the As-sublattice and tensile coherency strain at the GaAs1−x Nx/GaAs interface. In addition, an N-induced enhancement of the coherent phonon decay time is attributed to reduced LO phonon scattering associated with the enhanced electron effective masses that reduce the transient electron velocity.

AB - We investigated the influence of nitrogen (N) on coherent longitudinal optical (LO) phonons in dilute nitride semiconductor alloys. Terahertz time-domain spectroscopy reveals a reduced frequency (redshift) of LO phonons and enhanced decay times for coherent GaAs-like LO phonons emitted from GaAs1−x Nx in comparison to those from semi-insulating GaAs. We attribute the redshift of the phonon frequency to both N-alloying-induced compression of the As-sublattice and tensile coherency strain at the GaAs1−x Nx/GaAs interface. In addition, an N-induced enhancement of the coherent phonon decay time is attributed to reduced LO phonon scattering associated with the enhanced electron effective masses that reduce the transient electron velocity.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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ER -

Influence of nitrogen on coherent longitudinal optical phonons in GaAs_1−xN_x

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