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  • Photonic quadrupole topological phases

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    HAFEZI176010.pdf (3.273Mb)
    Author(s)
    Mittal, Sunil
    Orre, Venkata Vikram
    Zhu, Guanyu
    Gorlach, Maxim A
    Poddubny, Alexander
    Hafezi, Mohammad
    Griffith University Author(s)
    Hafezi, Mehdi
    Year published
    2019
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    Abstract
    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 transport1,2,3,4,5. 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 moments6,7,8. Here, we demonstrate ...
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    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 transport1,2,3,4,5. 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 moments6,7,8. 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.
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    Journal Title
    Nature Photonics
    DOI
    https://doi.org/10.1038/s41566-019-0452-0
    Copyright Statement
    © 2019 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Mathematical Sciences
    Physical Sciences
    Publication URI
    http://hdl.handle.net/10072/386304
    Collection
    • Journal articles

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