Revival resonant scattering, perfect caustics, and isotropic transport of pseudospin-1 particles

Hong-Ya Xu, Ying-Cheng Lai

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Abstract

We report unusual physics associated with wave scattering in pseudospin-1 systems whose band structure consists of a conventional Dirac cone and a topologically flat band. First, for small scatterer size, we find a surprising revival resonant scattering phenomenon and identify a peculiar type of boundary trapping profile through the formation of unusual vortices as the physical mechanism. Second, for larger scatterer size, a perfect caustic phenomenon arises as a manifestation of the super-Klein tunneling effect, leading to the scatterer's being effectively as a Veselago lens. Third, in the far scattering field, an unexpected isotropic behavior emerges at low energies, which can be attributed to the vanishing Berry phase for massless pseudospin-1 particles and, consequently, to constructive interference between the time-reversed backscattering paths. We develop an analytic theory based on the generalized Dirac-Weyl equation to fully explain these phenomena and articulate experimental schemes with photonic or electronic systems.
Original languageEnglish
Article number165405
JournalPhysical Review B Condensed Matter and Materials Physics
Volume94
Issue number16
DOIs
Publication statusPublished - 7 Oct 2016

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Caustics
alkalies
Scattering
scattering
Backscattering
Band structure
Photonics
Cones
Lenses
Vortex flow
Physics
wave scattering
Dirac equation
backscattering
cones
trapping
lenses
photonics
vortices
interference

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Revival resonant scattering, perfect caustics, and isotropic transport of pseudospin-1 particles. / Xu, Hong-Ya; Lai, Ying-Cheng.

In: Physical Review B Condensed Matter and Materials Physics , Vol. 94, No. 16, 165405 , 07.10.2016.

Research output: Contribution to journalArticle

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