title: Photonic Weyl degeneracies in magnetized plasma.
abstract: Weyl particles are elusive relativistic fermionic particles with vanishing mass. While not having been found as an elementary particle, they are found to emerge in solid-state materials where three-dimensional bands develop a topologically protected point-like crossing, a so-called Weyl point. Photonic Weyl points have been recently realised in three-dimensional photonic crystals with complex structures. Here we report the presence of a novel type of plasmonic Weyl points in a naturally existing medium-magnetized plasma, in which Weyl points arise as crossings between purely longitudinal plasma modes and transverse helical propagating modes. These photonic Weyl points are right at the critical transition between a Weyl point with the traditional closed finite equifrequency surfaces and the newly proposed 'type II' Weyl points with open equifrequency surfaces. Striking observable features of plasmon Weyl points include a half k-plane chirality manifested in electromagnetic reflection. Our study introduces Weyl physics into homogeneous photonic media, which could pave way for realizing new topological photonic devices.
authors: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.|State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China.
authors: Wenlong
authors: W
authors: Gao
authors: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.
authors: Biao
authors: B
authors: Yang
authors: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.|Department of Materials Science and Engineering, Stanford University, Stanford, California, 94305, USA.
authors: Mark
authors: M
authors: Lawrence
authors: State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China.
authors: Fengzhou
authors: F
authors: Fang
authors: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.
authors: Benjamin
authors: B
authors: Béri
authors: School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK.|State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China.
authors: Shuang
authors: S
authors: Zhang