Photonic Floquet topological insulators
Mikael C. Rechtsman,Julia M. Zeuner,Yonatan Plotnik,Yaakov Lumer,Daniel K. Podolsky,Felix Dreisow,Stefan Nolte,Mordechai Segev,Alexander Szameit +8 more
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This work proposes and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport—a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges.Abstract:
Topological insulators are a new phase of matter, with the striking property that conduction of electrons occurs only on their surfaces. In two dimensions, electrons on the surface of a topological insulator are not scattered despite defects and disorder, providing robustness akin to that of superconductors. Topological insulators are predicted to have wide-ranging applications in fault-tolerant quantum computing and spintronics. Substantial effort has been directed towards realizing topological insulators for electromagnetic waves. One-dimensional systems with topological edge states have been demonstrated, but these states are zero-dimensional and therefore exhibit no transport properties. Topological protection of microwaves has been observed using a mechanism similar to the quantum Hall effect, by placing a gyromagnetic photonic crystal in an external magnetic field. But because magnetic effects are very weak at optical frequencies, realizing photonic topological insulators with scatter-free edge states requires a fundamentally different mechanism-one that is free of magnetic fields. A number of proposals for photonic topological transport have been put forward recently. One suggested temporal modulation of a photonic crystal, thus breaking time-reversal symmetry and inducing one-way edge states. This is in the spirit of the proposed Floquet topological insulators, in which temporal variations in solid-state systems induce topological edge states. Here we propose and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport-a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges. Our system is composed of an array of evanescently coupled helical waveguides arranged in a graphene-like honeycomb lattice. Paraxial diffraction of light is described by a Schrodinger equation where the propagation coordinate (z) acts as 'time'. Thus the helicity of the waveguides breaks z-reversal symmetry as proposed for Floquet topological insulators. This structure results in one-way edge states that are topologically protected from scattering.read more
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Hybrid Acoustic Topological Insulator in Three Dimensions.
Cheng He,Si-Yuan Yu,Huaiqiang Wang,Hao Ge,Jiawei Ruan,Haijun Zhang,Ming-Hui Lu,Yan-Feng Chen +7 more
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Seeing topological winding number and band inversion in photonic dimer chain of split-ring resonators
TL;DR: In this paper, the dispersion relation and sublattice pseudospin vectors of different orientated configurations of split-ring resonators were measured to determine the associated winding number of bulk bands.
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Creating lattice gauge potentials in circuit QED: The bosonic Creutz ladder
Hadiseh Alaeian,C. W. S. Chang,Mehran Vahdani Moghaddam,Christopher Wilson,Enrique Solano,Enrique Solano,Enrique Solano,Enrique Rico,Enrique Rico +8 more
TL;DR: In this article, the effect of various types of capacitive and inductive couplings, and the role of the phase difference between adjacent sites on creating a complex hopping rate between coupled qubits are investigated.
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Topological phase transition in an all-optical exciton-polariton lattice
Maciej Pieczarka,Eliezer Estrecho,Sanjib Ghosh,Matthias Wurdack,Mark Steger,David W. Snoke,Kenneth D. West,Loren Pfeiffer,Timothy Chi Hin Liew,Andrew Truscott,Elena A. Ostrovskaya +10 more
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Defect modes for dislocated periodic media
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References
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