The research group is mainly engaged in the study of topological quantum physics, the development of magneto-infrared spectroscopy technology, the research and development of topological device applications, and the exploration of cross-disciplinary research. Due to topological protection, topological quantum materials exhibit quasiparticle behaviors that are entirely different from traditional electronics. Therefore, in basic physics, the exploration of topological quantum materials opens up new avenues for studying the properties of elementary particles; in applications, these special properties can be exploited to develop corresponding new devices, including widely concerned topological quantum computing. The research group has published 1 Nature, 2 Nature Materials, 3 Nature Communications, and 2 Nano Letters in recent years. In terms of international academic visits, the laboratory has a wealth of overseas cooperation relations, where high magnetic field experiments will be conducted in the national laboratories of the United States and France.

1.   Topological Physics  

We experimentally explore topological states and topological phase transitions under magnetic fields, especially focusing on the new dimension of topological effects. We know that physical laws have essentially different properties in different dimensions, for example, the decay law of the electric field of point charges with distance is different in one-dimensional, two-dimensional, and three-dimensional spaces. We use magnetic fields to change the effective dimensions of the system and solve topological physics problems in one-dimensional, two-dimensional, and three-dimensional spaces for specific scientific questions. We use infrared magnetic spectroscopy and other techniques to study traditional and new topological semimetals, including topological insulators, Dirac semimetals, Weyl semimetals, etc., and explore the physical properties of topological quantum states, such as chiral zero mode, chiral anomaly, Weyl orbit, Fermi arc, etc. At the same time, we are committed to the implementation of quantum control of the external field and intrinsic properties, including topological material dimension control, and external field realizations of symmetry control topological phase transitions, and so on.

Representative work: Discovery of one-dimensional Weyl fermions

2.   Extreme Condition Magneto-Infrared Spectroscopy

By combining precision spectroscopy and strong magnetic fields, we have developed distinctive magneto-optic detection equipment. We develop spectroscopy technology based on strong magnetic fields, particularly infrared spectroscopy technology, and combine it with ultra-low temperature, strong magnetic field, far-infrared, and precision optoelectronic detection technology. We also study complex systems under extreme conditions in conjunction with electrical transport, magnetism, and photo-electric current measurements under magnetic fields.

Representative work: Establishing a strong magnetic field infrared device

3. Topological Electronics and Optoelectronic Devices

Based on the basic research results of topological physics effects, we synthesize quantum functional materials of new types from nanoscale to wafer scale through various methods. Based on the research and development results of material properties, we test and develop devices with special functions, such as photodetectors and logic devices, to assist in precision optical detection.

Representative work: Achieving two-dimensional superlinear photovoltaic devices

4. Cross-Disciplinary Research

We conduct cross-disciplinary research in the fields of medicine, chemistry, and information, based on microscopic infrared and micro/nano studies.

Representative work: Predicting STILL rare diseases with a single human hair and preparing high-quality conductive films