中国物理B ›› 2026, Vol. 35 ›› Issue (2): 26301-026301.doi: 10.1088/1674-1056/adf5a5

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Light-induced modulation of electrical, optical, and thermodynamic properties via nonlinear phononics in perovskite KTaO3

Qi Yang(杨淇)1 and Hong Zhang(张红)1,2,†   

  1. 1 College of Physics, Sichuan University, Chengdu 610065, China;
    2 Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China
  • 收稿日期:2025-05-23 修回日期:2025-07-18 接受日期:2025-07-30 出版日期:2026-01-21 发布日期:2026-01-31
  • 通讯作者: Hong Zhang E-mail:hongzhang@scu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2024YFF0508503)

Light-induced modulation of electrical, optical, and thermodynamic properties via nonlinear phononics in perovskite KTaO3

Qi Yang(杨淇)1 and Hong Zhang(张红)1,2,†   

  1. 1 College of Physics, Sichuan University, Chengdu 610065, China;
    2 Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China
  • Received:2025-05-23 Revised:2025-07-18 Accepted:2025-07-30 Online:2026-01-21 Published:2026-01-31
  • Contact: Hong Zhang E-mail:hongzhang@scu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2024YFF0508503)

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摘要： Strong long-wavelength laser pulses enable direct manipulation of atomic lattices for engineering novel quantum states in complex materials. Nonlinear coupling between two infrared-active phonon modes (TO$_1$ and TO$_2$), induced by intense terahertz light fields, significantly enhances the amplitude of the TO$_1$ mode and facilitates ultrafast control of transient structural distortions. This light-induced distortion reduces the lattice thermal conductivity from 8.1 W$\cdot$m$^{-1}\cdot$K$^{-1}$ to 3.0 W$\cdot$m$^{-1}\cdot$K$^{-1}$. The reduction originates from the nonlinear coupling, which enhances anharmonic interactions in the lattice potential energy and substantially shortens the phonon lifetime ($\tau $). This work demonstrates a strategy applicable to other perovskite materials and provides a framework for investigating light-induced electrical, optical, and thermodynamic phase transitions.

关键词: ultrafast processes, ultrafast dynamics, first-principles calculation, phonon-phonon interactions

Abstract: Strong long-wavelength laser pulses enable direct manipulation of atomic lattices for engineering novel quantum states in complex materials. Nonlinear coupling between two infrared-active phonon modes (TO$_1$ and TO$_2$), induced by intense terahertz light fields, significantly enhances the amplitude of the TO$_1$ mode and facilitates ultrafast control of transient structural distortions. This light-induced distortion reduces the lattice thermal conductivity from 8.1 W$\cdot$m$^{-1}\cdot$K$^{-1}$ to 3.0 W$\cdot$m$^{-1}\cdot$K$^{-1}$. The reduction originates from the nonlinear coupling, which enhances anharmonic interactions in the lattice potential energy and substantially shortens the phonon lifetime ($\tau $). This work demonstrates a strategy applicable to other perovskite materials and provides a framework for investigating light-induced electrical, optical, and thermodynamic phase transitions.

Key words: ultrafast processes, ultrafast dynamics, first-principles calculation, phonon-phonon interactions

中图分类号:  (First-principles theory)

  • 63.20.dk
63.20.kg (Phonon-phonon interactions) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 87.15.ht (Ultrafast dynamics; charge transfer)