| CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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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 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 |
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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.
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Received: 23 May 2025
Revised: 18 July 2025
Accepted manuscript online: 30 July 2025
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PACS:
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63.20.dk
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(First-principles theory)
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63.20.kg
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(Phonon-phonon interactions)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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87.15.ht
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(Ultrafast dynamics; charge transfer)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2024YFF0508503) |
Corresponding Authors:
Hong Zhang
E-mail: hongzhang@scu.edu.cn
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Cite this article:
Qi Yang(杨淇) and Hong Zhang(张红) Light-induced modulation of electrical, optical, and thermodynamic properties via nonlinear phononics in perovskite KTaO3 2026 Chin. Phys. B 35 026301
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