Photonic quadrupole topological phases

By S. Mittal, Venkata Vikram Orre, Guanyu Zhu, M. Gorlach, A. Poddubny, M. Hafezi. Nature Photonics, 2018

501 citations recorded by the source corpus.

The topological phases of matter are characterized using the Berry phase, a geometrical phase associated with the energy-momentum band structure. The quantization of the Berry phase and the associated wavefunction polarization manifest as remarkably robust physical observables, such as quantized Hall conductivity and disorder-insensitive photonic transport1–5. Recently, a novel class of topological phases, called higher-order topological phases, were proposed by generalizing the fundamental relationship between the Berry phase and quantized polarization, from dipole to multipole moments6–8. Here, we demonstrate photonic realization of the quantized quadrupole topological phase, using silicon photonics. In our two-dimensional second-order topological phase, we show that the quantization of the bulk quadrupole moment manifests as topologically robust zero-dimensional corner states. We contrast these topological states against topologically trivial corner states in a system without bulk quadrupole moment, where we observe no robustness. Our photonic platform could enable the development of robust on-chip classical and quantum optical devices with higher-order topological protection.A higher-order topological phase is demonstrated, manifesting as robust, topologically protected corner modes in a silicon photonics system.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/599687ae365afcf8f10a6cdfe92c9e3aff4f8463

How researchers see this paper

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In Atomic and Molecular Physics, and Optics

1. K. Kawabata
2. Masatoshi Sato
3. Ken Shiozaki
4. Flore K. Kunst
5. E. Bergholtz
6. Mohamed Bourennane
7. Luis E. F. Foa Torres
8. Masahito Ueda

In Materials Chemistry

1. E. Bergholtz
2. K. Kawabata
3. Ken Shiozaki
4. Masatoshi Sato
5. Flore K. Kunst

Citations in the corpus

• Corner states of light in photonic waveguides (2018, background): “Note added: Independent of this work, other photonic realisations of corner states were simultaneously reported, albeit in two-dimensional setups [29, 30, 31, 32], which are entirely different from ours”
• Higher-order non-Hermitian skin effect (2020, background): “[26] S.”