Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective

doi:10.1088/1674-1056/ae5787

中国物理B ›› 2026, Vol. 35 ›› Issue (6): 64203-064203.doi: 10.1088/1674-1056/ae5787

Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective

Shiyu Zhang(张诗雨), Junjie Dong(董俊杰), Tongying Liu(刘彤影), and Wei-Tao Liu(刘韡韬)†

Physics Department, State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures of Ministry of Education (MOE), Fudan University, Shanghai 200433, China

收稿日期:2026-02-10 修回日期:2026-03-18 接受日期:2026-03-26 发布日期:2026-06-05
通讯作者: Wei-Tao Liu E-mail:wtliu@fudan.edu.cn
基金资助:
We acknowledge support from the National Natural Science Foundation of China (Grant No. 12250002), the National Key Research and Development Program of China (Grant No. 2024YFA1409803), and the Science and Technology Commission of Shanghai Municipality (Grant Nos. 23JC1400400 and 23DZ2260100).

Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective

Shiyu Zhang(张诗雨), Junjie Dong(董俊杰), Tongying Liu(刘彤影), and Wei-Tao Liu(刘韡韬)†

Physics Department, State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures of Ministry of Education (MOE), Fudan University, Shanghai 200433, China

Received:2026-02-10 Revised:2026-03-18 Accepted:2026-03-26 Published:2026-06-05
Contact: Wei-Tao Liu E-mail:wtliu@fudan.edu.cn
Supported by:
We acknowledge support from the National Natural Science Foundation of China (Grant No. 12250002), the National Key Research and Development Program of China (Grant No. 2024YFA1409803), and the Science and Technology Commission of Shanghai Municipality (Grant Nos. 23JC1400400 and 23DZ2260100).

摘要/Abstract

摘要： Functional oxides host emergent interfacial phenomena from superconductivity to catalysis, intimately tied to lattice phonons that mediate many-body interactions. Sum-frequency generation (SFG) spectroscopy, a second-order nonlinear optical technique with intrinsic surface specificity, enables in situ and operando probing of lattice vibrations at surfaces and interfaces. In this review, we introduce the basic theory of SFG and survey its application in investigating functional oxide surfaces and interfaces — tracking oxygen vacancies on anatase TiO$_{2}$, unveiling electron-phonon coupling modulation in LaAlO$_{3}$/SrTiO$_{3}$ heterostructures, and detecting polaronic signatures in Nb-doped SrTiO$_{3}$ — thereby offering microscopic insights into the physics of oxide interfaces.

关键词: sum frequency spectroscopy, oxide interfaces, interfacial phonons, polarons

Abstract: Functional oxides host emergent interfacial phenomena from superconductivity to catalysis, intimately tied to lattice phonons that mediate many-body interactions. Sum-frequency generation (SFG) spectroscopy, a second-order nonlinear optical technique with intrinsic surface specificity, enables in situ and operando probing of lattice vibrations at surfaces and interfaces. In this review, we introduce the basic theory of SFG and survey its application in investigating functional oxide surfaces and interfaces — tracking oxygen vacancies on anatase TiO$_{2}$, unveiling electron-phonon coupling modulation in LaAlO$_{3}$/SrTiO$_{3}$ heterostructures, and detecting polaronic signatures in Nb-doped SrTiO$_{3}$ — thereby offering microscopic insights into the physics of oxide interfaces.

Key words: sum frequency spectroscopy, oxide interfaces, interfacial phonons, polarons

中图分类号: (Nonlinear optics)

42.65.-k

68.35.Ja (Surface and interface dynamics and vibrations) 63.20.kd (Phonon-electron interactions)

Shiyu Zhang(张诗雨), Junjie Dong(董俊杰), Tongying Liu(刘彤影), and Wei-Tao Liu(刘韡韬). Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective[J]. 中国物理B, 2026, 35(6): 64203-064203.

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Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective

Phonons at functional oxide interfaces: An in situ sum-frequency spectroscopic perspective

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