Reconfigurable topological photonic crystal

Shalaev, Mikhail I.; Desnavi, Sameerah; Walasik, Wiktor; Litchinitser, Natalia M.

doi:10.1088/1367-2630/aaac04

Cited by 93 publications

(64 citation statements)

References 64 publications

(94 reference statements)

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“…We note that the system is periodic and does not require staggering the phases of the couplings, unlike the coupled-resonator system of Refs. [5,6,22] that can be dynamically reconfigured via optical, electrical, or thermal pumping [33,34]. Reconfigurability of topological systems has been demonstrated at microwave frequencies [13], but is yet to be achieved in the optical regime.…”

mentioning

confidence: 99%

Photonic Anomalous Quantum Hall Effect

et al. 2019

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We experimentally realize a photonic analogue of the anomalous quantum Hall insulator using a twodimensional (2D) array of coupled ring resonators. Similar to the Haldane model, our 2D array is translation invariant, has zero net gauge flux threading the lattice, and exploits next-nearest neighbor couplings to achieve a topologically non-trivial bandgap. Using direct imaging and on-chip transmission measurements, we show that the bandgap hosts topologically robust edge states. We demonstrate a topological phase transition to a conventional insulator by frequency detuning the ring resonators and thereby breaking the inversion symmetry of the lattice. Furthermore, the clockwise or the counter-clockwise circulation of photons in the ring resonators constitutes a pseudospin degree of freedom. We show that the two pseudospins acquire opposite hopping phases and their respective edge states propagate in opposite directions. These results are promising for the development of robust reconfigurable integrated nanophotonic devices for applications in classical and quantum information processing.Photonics has emerged as a versatile platform to explore model systems with nontrivial band topology, a phenomenon originally associated with condensed matter systems [1,2]. For example, photonic systems have realized analogues of the integer quantum Hall effect [3][4][5][6][7], Floquet topological insulators [8][9][10][11], quantum spin-Hall and valley-Hall phases [12][13][14][15][16], as well as topological crystalline insulators [17][18][19]. From an application perspective, the inherent robustness of the topological systems has enabled the realization of photonic devices that are protected against disorder, such as optical delay lines [6,7], lasers [20][21][22], quantum light sources [23], and quantum-optic interfaces for light-matter interactions [18]. At the same time, features unique to bosonic systems, such as the possibility of introducing gain and loss into the system [24-28], parametric driving, and squeezing of light [23,29,30], have provided an opportunity to explore topological phases that cannot be realized in fermionic systems.Despite these advances, there has not yet been a nanophotonic realization of the anomalous quantum Hall phase -a two-dimensional Chern insulator with zero net gauge flux [31,32]. This is noteworthy because the various topological phases differ significantly in the origin of non-trivial band topology, and therefore offer different forms of topological protection. For instance, topological edge states in valley-Hall and topological crystalline insulator lattices manifest on internal boundaries between "opposite" domains instead of external edges [14,17], and are protected only against certain boundary deformations (e.g., 120 • bends but not 90 • bends) [14,17]. The quantum Hall and anomalous quantum Hall phases, by contrast, are significantly more robust: topological edge states can appear along external edges, and are protected irrespective of the lattice shape. Moreover, whereas the quantum Hal...

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confidence: 99%

Photonic Anomalous Quantum Hall Effect

et al. 2019

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“…The artificial gauge field can be accomplished, for instance, by dynamic modulation, using auxiliary cavities, or by other means, as discussed and demonstrated in several recent works [37,[51][52][53][54][55][56][57][58][59][60]. We also mention that different types of reconfigurable two-dimensional photonic lattice configurations, with controllable switching between topologically trivial and non-trivial phases, have been suggested and demonstrated in several other different photonic setups [61][62][63][64][65][66].…”

Section: Model and Decoherence Dynamicsmentioning

confidence: 88%

Topological Protection and Control of Quantum Markovianity

2020

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Under the Born-Markov approximation, a qubit system, such as a two-level atom, is known to undergo a memoryless decay of quantum coherence or excitation when weakly coupled to a featureless environment. Recently, it has been shown that unavoidable disorder in the environment is responsible for non-Markovian effects and information backflow from the environment into the system owing to Anderson localization. This turns disorder into a resource for enhancing non-Markovianity in the system-environment dynamics, which could be of relevance in cavity quantum electrodynamics. Here we consider the decoherence dynamics of a qubit weakly coupled to a two-dimensional bath with a nontrivial topological phase, such as a two-level atom embedded in a two-dimensional coupled-cavity array with a synthetic gauge field realizing a quantum-Hall bath, and show that Markovianity is protected against moderate disorder owing to the robustness of chiral edge modes in the quantum-Hall bath. Interestingly, switching off the gauge field, i.e., flipping the bath into a topological trivial phase, allows one to re-introduce non-Markovian effects. Such a result indicates that changing the topological phase of a bath by a tunable synthetic gauge field can be harnessed to control non-Markovian effects and quantum information backflow in a qubit-environment system.

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“…Notably, while Dirac cones are known to emerge in all-dielectric, solid-made and non-reconfigurable setups, in our setup they emerge in reconfigurable optical liquid lattices. In particular, taking advantage of the compliant property of the liquid film allows position tuning of the Dirac points under optically induced surface tension stresses, which is markedly different than other recently suggested mechanisms to control topological properties of light in liquids, such as electrical tunability of liquid crystals [59].…”

Section: Bandstructure Of Wg and Spp Modes In Hexagonal And Rectangulmentioning

confidence: 97%

Nonlinear, tunable, and active optical metasurface with liquid film

Rubin

Fainman

2019

Adv. Photon.

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Optical metamaterials and metasurfaces which emerged in the course of the last few decades have revolutionized our understanding of light and light-matter interaction. While solid materials are naturally employed as key building elements for construction of optical metamaterials mainly due to their structural stability, practically no attention was given to study of liquid-made optical 2D metasurfaces and the underlying interaction regimes between surface optical modes and liquids. In this work, we theoretically demonstrate that surface plasmon polaritons and slab waveguide modes that propagate within a thin liquid dielectric film, trigger optical self-induced interaction facilitated by surface tension effects, which lead to formation of 2D optical liquid-made lattices/metasurfaces with tunable symmetry and which can be leveraged for tuning of lasing modes. Furthermore, we show that the symmetry breaking of the 2D optical liquid lattice leads to phase transition and tuning of its topological properties which allows to form, destruct and move Dirac-points in the k-space. Our results indicate that optical liquid lattices support extremely low lasing threshold relative to solid dielectric films and have the potential to serve as configurable analogous computation platform.

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Reconfigurable topological photonic crystal

Cited by 93 publications

References 64 publications

Photonic Anomalous Quantum Hall Effect

Photonic Anomalous Quantum Hall Effect

Topological Protection and Control of Quantum Markovianity

Nonlinear, tunable, and active optical metasurface with liquid film

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