Theory for low-dimensional quantum materials
·Surface & Interface Modeling
·Massive Manipulation & Artificial Creation
Recent publications
Layered semiconducting electrides in p-block metal oxides
Frontiers of Physics 20, (2025) Jiaqi Dai#, Feng Yang, Cong Wang, Fei Pang,...
Magnetically-controlled non-volatile charging states in bilayer graphene-CrOCl heterostructures
Advanced Materials 37, 202411300 (2024) Shimin Cao#, Runjie Zheng#, Cong...
Exploring Potential for Semiconductor to Quantum Anomalous Hall Insulator Transitions via Substrate-Induced Structural Modifications in Ti3Se4 Monolayers
Nano Reseach 18, 94907123 (2025) Zhipeng Song#, Haixia Cheng#, Yun Cao, Qi...
Coexistence of ferroelectricity and antiferroelectricity in 2D van der Waals multiferroic
Nature Communications 15, 8616 (2024) Yangliu Wu, Zhaozhuo Zeng, Haipeng Lu,...
Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
arXiv:2409.03214 (2024) Zhongqin Zhang† , Jiaqi Dai† , Cong Wang , Hua Zhu ,...
Discovery and manipulation of van der Waals polarons in Sb2O3 ultrathin molecular crystal
J. Am. Chem. Soc., DOI:10.1021/jacs.4c04450 (2024) ZhiHao Zhang, Linlu Wu,...
Recent News
研究组单分子尺度电子-振动激发合作研究获新突破
研究团队设计了一种新策略,在SnSe半导体上观察到C60分子的低频电子-振动激发模式,尤其是难以探测的Hg(ω1)模式。该研究揭示了电荷转移偶极增强电子-振动激发的机制,发表在2024年10月的《Science Advances》上。
“磁性二维材料的近期研究进展”获《物理学报》2024年度最有影响论文
2024年10月11日,由中国物理学会主办、海南大学承办的物理学会秋季学术会议在海口举行,在第六届中国物理期刊专场报告会上,中国人民大学物理学院季威教授作为通讯...
八名成员参加“中国物理学会2024秋季学术会议”
2024年10月11-13日,中国人民大学物理学院季威研究组七名博士生(戴佳琦、王人宏、朱华、宗灿波、刘泽宇、张伟涵、张忠钦)和一名硕士生(席郭灏)赴海口参加了...
See small, think big
Believe in seeing
- Microscopes empower human beings the capability of seeing nanostructures. We are interested in modeling those nanostructures being seen using a STM, nc-AFM or STEM. Interplay of those nanostructure with probes, e.g. a STM tip or electron beams, is of paramount importance, modeling of which is one of our missions.
- We, working closely with our experimental collaborators, observed the world’s first images of hydrogen bonding (Science 2013) and N…N quasi-bonding (Nat. Nanotech. 2018). The latter also verifies that the hydrogen bonding was indeed detected in the Science work.
At van der Waals gaps
- It was believed that van der Waals (vdW) interactions do not appreciably modify electronic structures of materials. However, we recently found significant wave function overlaps at inter-block regions (known as vdW gaps) of low-dimensional materials, called covalent-like quasi-bonding, which helps predict or explain many layer-dependent bandgaps, magnetism and electrical polarizations .
- We recently uncovered a few magnetic coupling mechanisms across their vdW gaps in e.g. CrI3 (PRB 2019), CrSe2 (PRB 2020 & Nat. Mater. 2021), CrTe2 (PRB 2020 & Nat. Communi. 2022), NiI2 and CrSBr, and found an OOP ferroelectricity in a MoS2/WS2 bilayer (Science 2022).
Atomic Electronics
- Moore’s law is a visionary guideline that keeps transistors evolving in the past over 60 years. As the channel length approaches the atomic scale, now it is 12 nm (tens of atoms) in IBM or Samsung’s 2 or 3 nm CMOS techniques, many of us believe that the atomicscale is the smallest sizescale that our devices, with novel functionalities, can work properly.
- We are dedicated to explore and propose novel functionalities of atomic devices, with moving the position or changing the state of an individual atom (small cluster).
- We proposed the world’s smallest electret and demonstrated its device functionality in a Gd@C82 devices (Nat. Nanotech. 2020).
Group Leader
Ji, Wei
Dr. Ji, Wei
Professor of Physics
Rm. 205A, Physics Bldg. Zhongguancun North Campus, RUC
wji@ruc.edu.cn
+86-10-62515597
senier researcher
Wang, Cong
Dr. Wang, Cong
Research Assoc. Prof.
Rm. 209, Physics Bldg.
Zhongguancun North Campus, RUC
wc_phys@ruc.edu.cn
+86-10-62517997
Post-doctoral fellow
Liu, Nanshu
Dr. Liu, Nanshu
Postdoctoral Fellow
Rm. 209, Physics Bldg. Zhongguancun North Campus, RUC
liuns@ruc.edu.cn
+86-10-62517997
PhD student
Wu, Linlu
Ms. Wu, Linlu
PhD student (P4)
Rm. 206, Physics Bldg.
Zhongguancun North Campus, RUC
wulinlu@ruc.edu.cn
+86-10-62517997