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Photonic Topological Spin Pump in Synthetic Frequency Dimensions

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Authors

Suh, Joseph; Kim, Gyunghun; Park, Hyungchul; Fan, Shanhui; Park, Namkyoo; Yu, Sunkyu

Issue Date
2024-01
Publisher
American Physical Society
Citation
Physical Review Letters, Vol.132 No.3, p. 033803
Abstract
Reducing geometrical complexity while preserving desired wave properties is critical for proof-of-concept studies in wave physics, as evidenced by recent efforts to realize photonic synthetic dimensions, isospectrality, and hyperbolic lattices. Laughlin's topological pump, which elucidates quantum Hall states in cylindrical geometry with a radial magnetic field and a time-varying axial magnetic flux, is a prime example of these efforts. Here we propose a two-dimensional dynamical photonic system for the topological pumping of pseudospin modes by exploiting synthetic frequency dimensions. The system provides the independent control of pseudomagnetic fields and electromotive forces achieved by the interplay between mode-dependent and mode-independent gauge fields. To address the axial open boundaries and azimuthal periodicity of the system, we define the adjusted local Chern marker with rotating azimuthal coordinates, proving the nontrivial topology of the system. We demonstrate the adiabatic pumping for crosstalk-free frequency conversion with wave front molding. Our approach allows for reproducing Laughlin's thought experiment at room temperature with a scalable setup.
ISSN
0031-9007
URI
https://hdl.handle.net/10371/202182
DOI
https://doi.org/10.1103/PhysRevLett.132.033803
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  • College of Engineering
  • Department of Electrical and Computer Engineering
Research Area Disordered, Open-System Wave Mechanics, Photonic AI Systems, Photonic Neuromorphic Devices, 광학 뉴로모픽 소자, 광학 인공지능 시스템, 무질서, 열린계 파동역학

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