6 papers
Wave Topology in Hall MHD
Alejandro Mesa Dame, Hong Qin, Eric Palmerduca +1
Hall Magnetohydrodynamics (HMHD) extends ideal MHD by incorporating the Hall effect via the induction equation, making it more accurate for describing plasma behavior at length sca…
The topology, geometry, and angular momentum of cold plasma waves
Eric Palmerduca, Hong Qin
It was recently discovered that plasma waves possess topologically protected edge modes, indicating the existence of topologically nontrivial structures in the governing equations.…
Spin-weighted spherical harmonics as massless angular momentum eigenstates and their role in obstructing spin-orbital decompositions
Eric Palmerduca, Hong Qin
We show that for massless helicity particles, the angular momentum eigenstates are given in an appropriate coordinate system by the spin-weighted spherical harmonics ${_{-h}Y_{…
Zero curvature is a necessary and sufficient condition for a spin-orbital decomposition
Eric Palmerduca, Hong Qin
There has been an extended debate regarding the existence of a spin-orbital decomposition of the angular momentum of photons and other massless particles. It was recently shown tha…
Four no-go theorems on the existence of spin and orbital angular momentum of massless bosons
Eric Palmerduca, Hong Qin
The past decades have seen substantial interest in the so-called orbital angular momentum (OAM) of light, driven largely by its diverse range of applications. However, there are fu…
Oblique photons, plasmons, and current-plasmons in relativistic plasmas and their topological implications
Hong Qin, Eric Palmerduca
Photons in vacuum are transverse in any inertial frame; longitudinal photons only exist virtually. By developing a manifestly covariant theory for electromagnetic excitations in re…