786 citations · 5.7k across the 70 of their papers we have counts for
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Third-harmonic generation in photonic topological metasurfaces
Daria Smirnova, Sergey Kruk, Daniel Leykam +3
We study nonlinear effects in two-dimensional photonic metasurfaces supporting topologically-protected helical edge states at the nanoscale. We observe strong third-harmonic genera…
Parity anomaly laser
Daria A. Smirnova, Pramod Padmanabhan, Daniel Leykam
We propose a novel supersymmetry-inspired scheme for achieving robust single mode lasing in arrays of coupled microcavities, based on factorizing a given array Hamiltonian into its…
Valley vortex states and degeneracy lifting via photonic higher-band excitation
Daohong Song, Daniel Leykam, Jing Su +7
We demonstrate valley-dependent vortex generation in a photonic graphene. Without breaking the inversion symmetry, excitation of two equivalent valleys leads to formation of an opt…
Unconventional Flatband Line States in Photonic Lieb Lattices
Shiqi Xia, Ajith Ramachandran, Shiqiang Xia +9
Flatband systems typically host "compact localized states"(CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless…
Nonlinear symmetry breaking of Aharonov-Bohm cages
Goran Gligorić, Petra P. Beličev, Daniel Leykam +1
We study the influence of mean field cubic nonlinearity on Aharonov-Bohm caging in a diamond lattice with synthetic magnetic flux. For sufficiently weak nonlinearities the Aharonov…
Observation of valley Landau-Zener-Bloch oscillations and pseudospin imbalance in photonic graphene
Yong Sun, Daniel Leykam, Stephen Nenni +4
We demonstrate inter-valley Bloch oscillation (BO) and Landau-Zener tunneling (LZT) in an optically-induced honeycomb lattice with a refractive index gradient. Unlike previously ob…
Disorder-robust entanglement transport
Clemens Gneiting, Daniel Leykam, Franco Nori
We study the disorder-perturbed transport of two entangled particles in the absence of backscattering. This situation is, for instance, realized along edges of topological insulato…
Reconfigurable topological phases in next-nearest-neighbor coupled resonator lattices
Daniel Leykam, S. Mittal, M. Hafezi +1
We present a reconfigurable topological photonic system consisting of a 2D lattice of coupled ring resonators, with two sublattices of site rings coupled by link rings, which can b…
Exceptional points in topological edge spectrum of PT symmetric domain walls
Xiang Ni, Daria Smirnova, Alexander Poddubny +3
We demonstrate that the non-Hermitian parity-time (PT) symmetric interfaces formed between amplifying and lossy crystals support dissipationless edge states. These PT edge states e…
Artificial flat band systems: from lattice models to experiments
Daniel Leykam, Alexei Andreanov, Sergej Flach
Certain lattice wave systems in translationally invariant settings have one or more spectral bands that are strictly flat or independent of momentum in the tight binding approximat…