Anisotropic Light–Matter Interaction in TiO <sub>2</sub>
Anisotropy has been extensively harnessed in heat control, energy harvesting, and light–matter interaction (LMI) systems. As a renowned LMI compound, the LMI anisotropy of TiO2 has so far remained elusive. Leveraging the highlight anisotropy characters in the 2D crystal, here, we revealed an LMI anisotropy feature of the (110) plane in rutile-TiO2 single crystal. The photoelectricity exhibits notably anisotropy, where a significantly higher current response is observed along the y-axis direction. The light absorption and irradiation enhancements have been reflected in Raman intensity variations, indicating a stronger atomic vibration significantly modulates the electron density wave function along y-axis, leading to an increase of hot electrons incoherent transport. Meanwhile, electron–phonon scattering intensifies due to the coupling between low-effective-mass electrons. Thereby, hot electrons preferentially transport along the y-axis rather than the x-axis, ultimately leading to an LMI anisotropy. Our investigation provides an intriguing insight for potential optimization in broadly light–matter reactions.
Authors
- Xiao Sun (ORCID: https://orcid.org/0000-0003-4575-3455)
- Xing Fan (ORCID: https://orcid.org/0000-0002-0681-0093)
- Jian Zhen Ou (ORCID: https://orcid.org/0000-0002-6971-2634)
- Junfang Zhao
- Yange Luan (ORCID: https://orcid.org/0000-0003-4622-1071)
- Haiping Lin (ORCID: https://orcid.org/0000-0002-9948-7060)
- Xiaobo Sharon Hu (ORCID: https://orcid.org/0000-0002-6636-9738)
- Guanyu Chen (ORCID: https://orcid.org/0000-0002-0269-1357)
- Zhifu Liu (ORCID: https://orcid.org/0000-0002-7884-7450)
- Liguo Chen (ORCID: https://orcid.org/0000-0002-5898-3148)
- Li Li (ORCID: https://orcid.org/0000-0001-5383-797X)
- Mingsheng Ma (ORCID: https://orcid.org/0000-0003-4485-2945)
Institutions
- Koblenz University of Applied Sciences (DE)
- Chinese Academy of Sciences (CN)
- Soochow University (CN)
- Chinese Academy of Engineering (CN)
- MIT University (MK)
- Robotics Research (United States) (US)
- Academy of Mathematics and Systems Science (CN)
- Technical Institute of Physics and Chemistry (CN)
- Physical and Technical Institute (BY)
- Shanghai Institute of Ceramics (CN)
- Southwest Jiaotong University (CN)
- RMIT University (AU)
- Shaanxi Normal University (CN)
Publication Details
- Journal
- ACS Materials Letters
- Published
- 2025-11-07
- DOI
- https://doi.org/10.1021/acsmaterialslett.5c00807
- Primary Topic
- Electronic and Structural Properties of Oxides
- Type
- article
- Field-Weighted Citation Impact
- 0.00