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

Hong-Ya Xu, Ying-Cheng Lai

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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
Issue number16
Publication statusPublished - 7 Oct 2016

Bibliographical note

This work was supported by ONR under Grant No. N00014-16-1-2828.


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