Magneto-infrared spectroscopy of Weyl Fermion in new spatial dimension
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TDLI Meeting Room N600 (East Wing of Floor 6, North Building)
Chiral fermion can be defined in odd spatial dimension. Weyl semimetals, as a new topological quantum phase that hosts Weyl nodes in the bulk, have stimulated a surge of research activities. When introducing Weyl semimetal, one usually starts with 1D Weyl equation which acts as a textbook model due to its importance and simplicity. However, the investigation of Weyl fermion and its property has been mostly focused in three dimensions.
In this talk, we will discuss recent progress of Weyl fermion in new dimension based on the high field magneto-infrared spectroscopy, as well as its potential in far-infrared photodetection. (1) The discovery of 1D Weyl fermion in 3D topological insulator. In the extreme quantum limit of topological insulator, band inversion drives the zeroth Landau bands to cross with each other and forms one-dimensional Weyl mode. (2) The discovery of 1D chiral Landau level and dynamic chiral anomaly. (3) The discovery of Weyl-loop based 3D quantum Hall effect. These results present magneto-infrared spectroscopy as indispensable tools for studying topological property under high magnetic field.
Yuan Xiang received a bachelor's degree in physics from Fudan University in 2014 and a Ph. D in condensed matter physics from Fudan University in 2019. In the same year, he joined East China Normal University. He mainly researches in properties of topological condensed matter under high magnetic field and interests in exploring topological physical phenomena in new spatial dimensions. He develops infrared spectroscopy technology under high magnetic field. A total of 35 papers were published, with a total of 2300 citations; the representative results were published as the first/corresponding author (including co-authors) 1 in Nature, 2 in Nature Materials, and 2 in Nature Communications; selected as one of the top ten advances in optics in China.
