Background Information: 

Dr. Ruan is an Assistant Professor and Ph.D. Advisor at the Eastern Institute of Technology, Ningbo. He obtained his Ph.D. from Nanjing University in 2019 and subsequently conducted postdoctoral research at the University of California, Berkeley, and Lawrence Berkeley National Laboratory. His research focuses on theoretical studies of light-matter interactions, topological states, and correlated electronic states in condensed matter physics, with an emphasis on developing efficient numerical methods. He has made several innovative contributions in predicting topological quantum materials and advancing many-body theories and computational methods for nonlinear optical responses. Dr. Ruan is a member of the development team for the electronic structure calculation code BerkeleyGW, where he serves as a key contributor to the nonlinear optics and time-dependent GW modules. Dr. Ruan has published many papers in leading journals such as PRL, PNAS, Nature, Nature Communications, Nano Letters, and PRB, with the most-cited first-author paper receiving over 260 citations. He has received several awards, including the Special Prize from the Collaborative Innovation Center of Advanced Microstructures (2016), among others.

Ruan Group Website: https://www.physruan.com

Research Field:

Focused on condensed matter theory and first-principles calculations of quantum materials. Current interests include (but are not limited to):

(1) Exotic quantum phenomena in low-dimensional materials: exciton physics, correlated electronic states, and moiré superlattice physics;

(2) Light–matter interaction-driven phenomena: nonlinear optical effects, ultrafast dynamics of excited states, and photoinduced phase transitions;

(3) Quantum geometry, band topology and their effects on transport and optical properties;

(4) Electrical, magnetic, and electron–phonon coupling properties of novel materials, along with function-oriented material design;

(5) Development of first-principles computational methods for the above topics, combining density functional theory, many-body perturbation theory (e.g., GW and Bethe–Salpeter Equation), nonequilibrium Green's function techniques, and machine learning approaches.

Educational Background:

2014.09-2019.09, Ph.D. (Theoretical Physics), Nanjing University, School of Physics

2010.09-2014.06, Bachelor’s (Physics), Sun Yat-sen University, School of Physics

Work Experience:

2025.03-Present: Assistant Professor, Eastern Institute of Technology, Ningbo

2019.10-2025.02: Postdoctoral Researcher, University of California, Berkeley 

Representative Works:

Google Scholar：

https://scholar.google.com/citations?user=WGX8OzIAAAAJ&hl=en

ORCID:

https://orcid.org/0009-0008-9759-7216

Representative Works (* refers to the corresponding author)

1. J. Ruan, Z. Li, C. S. Ong, S. G. Louie, Optically controlled single-valley exciton doublet states with tunable internal spin structures and spin magnetization generation. Proc. Natl. Acad. Sci. 120, e2307611120 (2023).

2. J. Ruan, Y.-H Chan, S. G. Louie, Exciton enhanced nonlinear optical responses in monolayer h-BN and MoS2: Insight from first-principles exciton-state coupling formalism and calculations. Nano Lett. 24, 15533 (2024).

3. J. Ruan, S.-K. Jian, D. Zhang, H. Yao, H. Zhang, S.-C. Zhang, D. Xing, Ideal Weyl Semimetals in the Chalcopyrites CuTlSe2, AgTlTe2, AuTlTe2, and ZnPbAs2. Phys. Rev. Lett. 116 (2016).

4. J. Ruan, S.-K. Jian, H. Yao, H. Zhang, S.-C. Zhang, D. Xing, Symmetry-protected ideal Weyl semimetal in HgTe-class materials. Nat. Commun. 7, 111368 (2016).

5. H. Wang, J. Ruan, H. Zhang, Non-Hermitian nodal-line semimetals with an anomalous bulk-boundary correspondence. Phys. Rev. B. 99 (2019).

6. S. Song, T. Yu, W. Tang, Z. Xu, Y. He, J. Ruan, T. Kojima, W. Hu, F. Giessibl, H. Sakaguchi, S. G. Louie, J. Lu, Janus graphene nanoribbons with localized states on a single zigzag edge. Nature 637, 580 (2025).