Spin- and valley-polarized one-way Klein tunneling in photonic topological insulators

Science Advances
Xiang NiAlexander B Khanikaev

Abstract

Recent advances in condensed matter physics have shown that the spin degree of freedom of electrons can be efficiently exploited in the emergent field of spintronics, offering unique opportunities for efficient data transfer, computing, and storage (1-3). These concepts have been inspiring analogous approaches in photonics, where the manipulation of an artificially engineered pseudospin degree of freedom can be enabled by synthetic gauge fields acting on light (4-6). The ability to control these degrees of freedom significantly expands the landscape of available optical responses, which may revolutionize optical computing and the basic means of controlling light in photonic devices across the entire electromagnetic spectrum. We demonstrate a new class of photonic systems, described by effective Hamiltonians in which competing synthetic gauge fields, engineered in pseudospin, chirality/sublattice, and valley subspaces, result in bandgap opening at one of the valleys, whereas the other valley exhibits Dirac-like conical dispersion. We show that this effective response has marked implications on photon transport, among which are as follows: (i) a robust pseudospin- and valley-polarized one-way Klein tunneling and (ii) topological ...Continue Reading

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Citations

May 22, 2018·Advanced Materials·Zhen GaoBaile Zhang
Oct 2, 2019·Physical Review Letters·Daria SmirnovaYuri Kivshar
Apr 13, 2019·Physical Review Letters·Daohong SongZhigang Chen
Nov 25, 2018·Optics Express·Bi-Ye XieYan-Feng Chen
Jan 5, 2019·Science·Mohammad-Ali Miri, Andrea Alù
Apr 22, 2020·Nature Communications·Gui-Geng LiuBaile Zhang
Jun 8, 2018·Nature Communications·Charlie-Ray MannEros Mariani
Jul 31, 2019·Nature Communications·Maren E MossmanPeter Engels
Jun 1, 2019·Light, Science & Applications·Weimin YeShuang Zhang
Feb 23, 2019·Nature Communications·Xin-Tao HeJian-Wen Dong
Jan 16, 2021·Physical Review Letters·Peiheng ZhouBaile Zhang
Feb 2, 2021·Science Advances·Xiang XiXiankai Sun
Jun 23, 2021·Optics Express·Huyen Thanh PhanKatsunori Wakabayashi
Sep 17, 2021·Nature Communications·Jian Wei YouTie Jun Cui

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Software Mentioned

COMSOL Multiphysics

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