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1. Pockels soliton microcomb

   https://doi.org/10.1038/s41566-020-00704-8  

   Bruch, Alexander W.; Liu, Xianwen; Gong, Zheng; Surya, Joshua B.; Li, Ming; Zou, Chang-Ling; Tang, Hong X. (January 2021, Nature Photonics)
2. Quantum corrections to soliton energies

   https://doi.org/10.1142/S0217751X22410044  

   Graham, N.; Weigel, H. (April 2022, International Journal of Modern Physics A)

   Milton, K. (Ed.)

   We review recent progress in the computation of leading quantum corrections to the energies of classical solitons with topological structure, including multi-soliton models in one space dimension and string configurations in three space dimensions. Taking advantage of analytic continuation techniques to efficiently organize the calculations, we show how quantum corrections affect the stability of solitons in the Shifman–Voloshin model, stabilize charged electroweak strings coupled to a heavy fermion doublet, and bind Nielsen–Olesen vortices at the classical transition between type I and type II superconductors. 

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3. Fractional Integrable Nonlinear Soliton Equations

   https://doi.org/10.1103/PhysRevLett.128.184101  

   Ablowitz, Mark J.; Been, Joel B.; Carr, Lincoln D. (May 2022, Physical Review Letters)
4. Perfect Soliton Crystals on Demand

   https://doi.org/10.1002/lpor.201900339  

   He, Yang; Ling, Jingwei; Li, Mingxiao; Lin, Qiang (July 2020, Laser & Photonics Reviews)

   Abstract Recent advances in of soliton microcombs have shown great promise to revolutionize many important areas such as optical communication, spectroscopic sensing, optical clock, and frequency synthesis. A largely tunable comb line spacing is crucial for the practical application of soliton microcombs, which unfortunately is challenging to realize for an on‐chip monolithic microresonators. The recently discovered perfect soliton crystal (PSC) offers a convenient route to tune the comb line spacing. However, excitation of a PSC is generally stochastic by its nature and accessing a certain PSC state requires delicate tuning procedure. Here the on‐demand generation of PSCs in a lithium niobate microresonator is demonstrated. The unique device characteristics allow to produce a variety of PSCs and to switch between different PSC states, deterministically and repetitively. The device is utilized to show arbitrary dialing of the comb line spacing from 1 to 11 times of the free‐spectral range of the resonator. The demonstration of PSCs on demand may now open up a great avenue for flexibly controlling the repetition rate of soliton pulses, which would significantly enhance and extend the application potential of soliton microcombs for communication, signal processing, and sensing. 

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5. Near-Visible Microresonator-Based Soliton Combs

   https://doi.org/10.1364/CLEO_SI.2019.STh3J.1  

   Zhao, Yun; Ji, Xingchen; Kim, Bok Young; Donvalkar, Prathamesh; Jang, Jae; Joshi, Chaitanya; Yu, Mengjie; Domeneguetti, Renato R.; Barbosa, Felippe A.; Nussenzveig, Paulo; et al (January 2019, Conference on Lasers and Electro-Optics)

   We experimentally demonstrate soliton mode-locked Kerr comb generation at near-visible wavelengths in a silicon nitride microresonator. We achieve the shortest wavelength to-date for mode-locked Kerr combs through dispersion engineering of a higher-order mode. 

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