Tianyi Ouyang

Tianyi Ouyang

Postdoctoral Fellow
Carnegie Mellon University

Email: touya001@ucr.edu
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I am a postdoctoral researcher in Condensed Matter Physics. My research focuses on optical properties of excitonic effects in two-dimensional transition metal dichalcogenides (TMDs), including dark excitons brightening, interlayer exciton hybridizations, and exciton-polaron effects.

Education

  • Postdoc in Physics, Carnegie Mellon University, USA (2025–Present) (Advisor: Prof. Su-Fei Shi)
  • Ph.D. in Physics, University of California, Riverside, USA (2019–2025) (Advisor: Prof. Chun Hung Lui)
  • B.S. in Physics, University of Science and Technology of China, China (2015–2019)

Awards & Honors

  • Dissertation Completion Fellowship Award (2025)
  • UCR Outstanding Teaching Assistant Award (2024-2025)
  • USTC Outstanding Student Scholarship Silver Award (2016)

Research Interests

  • Interlayer exciton absorption in layered TMDs
  • Interlayer polarizations and sliding ferroelectricity
  • Exciton-polaron effects
  • Moire exciton and charge correlation effects in TMD heterostructures

Selected Publications

Tianyi Ouyang†, Erfu Liu†, Soonyoung Cha†, Raj Kumar Paudel, Yiyang Sun, Zhaoran Xu, Takashi Taniguchi, Kenji Watanabe, Nathaniel M. Gabor*, Yia-Chung Chang*, Chun Hung Lui*.
Brightening interlayer excitons by electric-field-driven hole transfer in bilayer WSe₂, arXiv preprint 2506.22660 (2025)

Soonyoung Cha†, Zhaoran Xu†, Tianyi Ouyang†, Hongyu Yao, Raj Kumar Paudel, Takashi Taniguchi, Kenji Watanabe, Andrew Y. Joe, Yia-Chung Chang*, Nathaniel M. Gabor*, Chun Hung Lui*.2p interlayer exciton revealed by hybridization in bilayer MoS₂, ResearchSquare 6734783/v1 (2025)

Tianyi Ouyang†, Soonyoung Cha†, Yiyang Sun, Takashi Taniguchi, Kenji Watanabe, Nathaniel M. Gabor*, Chun Hung Lui*. Electrically Switching Ferroelectric Order in 3R‑MoS₂ Layers, Nano Letters 25(4), 1459–1465 (2025)

Soonyoung Cha†, Tianyi Ouyang†, Takashi Taniguchi, Kenji Watanabe, Nathaniel M. Gabor*, Chun Hung Lui*. Enhancing Resonant Second‑Harmonic Generation in Bilayer WSe₂ by Layer‑Dependent Exciton‑Polaron Effect, Nano Letters 24(46), 14847–14853 (2024)

Conferences