2020
DOI: 10.1103/physrevresearch.2.043148
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Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Abstract: We demonstrate the coexistence of pseudospin-and valley-Hall-like edge states in a photonic crystal with C 3v symmetry, which is composed of three interlacing triangular sublattices with the same lattice constants. By tuning the geometry of the sublattices, three complete photonic band gaps with nontrivial topology can be created, one of which is due to the band inversion associated with the pseudospin degree of freedom at the point and the other two due to the gapping out of Dirac cones associated with the va… Show more

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Cited by 45 publications
(11 citation statements)
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“…The LPWSs have great potential for practical applications, such as topological channel intersections, topological energy concentrators, topological cavities with tunable mode confinement, and high-capacity energy splitters. Compared to conventional topological edge states, LPWSs are more compatible with interfacing with existing waveguide-based photonic devices, making them appealing for applications in different scenarios, such as multiband, 53 reconfigurable, 29 wavelength division multiplexing, 54 , 55 and coexistence of different topological states 56 , 57 . For future works, it would be interesting to experimentally investigate the LPWSs at higher frequencies, such as terahertz, infrared, and optical frequencies, for more compact on-chip applications.…”
Section: Discussionmentioning
confidence: 99%
“…The LPWSs have great potential for practical applications, such as topological channel intersections, topological energy concentrators, topological cavities with tunable mode confinement, and high-capacity energy splitters. Compared to conventional topological edge states, LPWSs are more compatible with interfacing with existing waveguide-based photonic devices, making them appealing for applications in different scenarios, such as multiband, 53 reconfigurable, 29 wavelength division multiplexing, 54 , 55 and coexistence of different topological states 56 , 57 . For future works, it would be interesting to experimentally investigate the LPWSs at higher frequencies, such as terahertz, infrared, and optical frequencies, for more compact on-chip applications.…”
Section: Discussionmentioning
confidence: 99%
“…By combining two structures with opposite topological phases, i.e. the valley Chern number, the valley topological edge states (VTESs) can be achieved [20][21][22][23]. To change the TES configuration, one has to change the bulky structure.…”
Section: Model and Topological Phasesmentioning
confidence: 99%
“…A richer phase diagram of the nonlocal chiral media is shown in figure 5(d). The locations (black curves) of Weyl points are obtained by equation (8). The curves of Weyl points also divide the whole zone into three sections.…”
Section: Type I/ii Weyl Points and Topological Phase Transitionsmentioning
confidence: 99%
“…It describes the invariance under continuous deformation [1][2][3][4][5]. The idea of topological phases in photonics stems from the exciting development of solid materials, which have fundamentally changed our understanding of the phase of matter [6][7][8][9][10][11][12][13][14][15][16]. The novel topological phases have been proposed and studied in photonic systems, including topological insulators [17], topological semimetals [18], and non-abelian topological charges [19].…”
Section: Introductionmentioning
confidence: 99%