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The group focuses on research in topological quantum physics, the development of magneto-infrared spectroscopy under high magnetic fields, the realization of topological infrared devices, and interdisciplinary studies. Owing to topological protection, topological quantum materials exhibit quasiparticle behaviors fundamentally distinct from those in conventional electronic systems. From the perspective of fundamental physics, these materials provide a new platform for exploring the properties of elementary particles. In terms of applications, their unique characteristics offer opportunities for developing novel devices, including those relevant to topological quantum computing. The main research directions are as follows:

1. Topological Quantum Physics Investigation of topological quantum states under strong magnetic fields. 

By utilizing Landau quantization to reconstruct electronic structures, the group aims to achieve effective control of orbital and spin orders and to explore novel topological phases and quantum responses arising from Landau bands. Representative works: discovery of one-dimensional Weyl fermions; discovery of three-dimensional van Hove singularities.

2. Development of Magneto-Infrared Spectroscopy under High Magnetic Fields

Advancement of magneto-infrared spectroscopy techniques to address key challenges such as low sensitivity and limited spectral coverage under strong magnetic fields, enabling high-precision infrared measurements in extreme conditions. Representative works: development of a high-precision, broadband, polarization-resolved magneto-infrared spectroscopy system.

3. Topological Infrared Devices

Based on fundamental studies in topological quantum physics, the group explores novel infrared response mechanisms and establishes new principles for infrared functional devices. Representative works: realization of strong and broadband optical chiral discrimination based on particle-hole symmetry breaking.

4. Interdisciplinary Research 

Leveraging advances in instrumentation, the group conducts interdisciplinary research across medicine, information science, and materials science using techniques such as infrared microscopy and high magnetic fields. Representative works: prediction of Still's disease based on infrared spectroscopy of a single human hair.

In the past five years, the group has published 1 paper in Nature, 3 in Nature Materials, and 3 in Nature Communications. Each student, including undergraduates, is assigned an independent research project upon joining the group, enabling many first- and second-year students to publish high-quality papers.

The group also maintains extensive international collaborations. High magnetic field experiments are conducted at national laboratories in the United States and France, providing students with ample opportunities for international academic exchange and research visits.

Contact Information:

Email: xyuan@lps.ecnu.edu.cn

Lab Location: Optics Building B102, B103, B105, Minhang Campus, East China Normal University

For more information, please visit our lab website: http://yuanlab.ecnu.edu.cn/