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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TLDR
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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Floquet-engineered topological flat bands in irradiated twisted bilayer graphene
TL;DR: In this article, an optically tunable platform was proposed to create topological flat bands in twisted bilayer graphene using circularly polarized UV laser light, which can be used to create a topological lattice.
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Z 2 topological edge state in honeycomb lattice of coupled resonant optical waveguides with a flat band
Xue-Yi Zhu,Samit Kumar Gupta,Xiaochen Sun,Cheng He,Guixin Li,Jian-Hua Jiang,Xiaoping Liu,Ming-Hui Lu,Yan-Feng Chen +8 more
TL;DR: Based on the honeycomb CROW lattice, the shape-independent topological cavity and the beam splitter are designed, which demonstrate the relevance for a wide range of photonic applications.
Journal ArticleDOI
Topological networks for quantum communication between distant qubits
Nicolai Lang,Hans Peter Büchler +1 more
TL;DR: In this paper, a linear network of coupled bosonic degrees of freedom, characterized by topological bands, can be employed for the efficient exchange of quantum information over large distances, where all relevant operations can be performed by global variations of parameters and the time required for communication between distant qubits approaches linear scaling with their distance.
Journal ArticleDOI
Layered Photonic Topological Insulators.
Xiao Dong Chen,Jian-Wen Dong +1 more
TL;DR: In this paper, the phase transition of layered photonic topological insulators based on all-dielectric bilayer photonic crystal slabs has been investigated with a model Hamiltonian by considering the nonzero interlayer coupling.
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Ultrafast Preparation and Detection of Ring Currents in Single Atoms
Sebastian Eckart,Maksim Kunitski,Martin Richter,Alexander Hartung,Jonas Rist,Florian Trinter,K. Fehre,Nikolai Schlott,K. Henrichs,Lothar Ph. H. Schmidt,Till Jahnke,Markus Schöffler,Kunlong Liu,Ingo Barth,Jivesh Kaushal,Felipe Morales,Misha Ivanov,Olga Smirnova,Reinhard Dörner +18 more
TL;DR: In this paper, the authors measured how the transmission probability through a rotating tunnel depends on the sign of the magnetic quantum number m of the electron and thus on the initial sense of rotation of its quantum phase.
References
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