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Excitation threshold of solitons in anharmonic chains |
| Yi Ming(明燚)† |
| School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, China |
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Abstract This study numerically estimates the momentum threshold required to excite solitons in anharmonic chains. For both Fermi-Pasta-Ulam-Tsingou (FPUT)-$\alpha\beta$ and FPUT-$\beta$ chains, regardless of whether the interatomic interaction potential is symmetric, the required excitation momentum converges to the momentum of the soliton center (i.e., the peak momentum of the soliton) as the number of initially excited atoms increases. As the amplitude of the soliton approaches zero, the momentum threshold decreases to nearly zero, allowing soliton being excited with infinitesimal initial excitation momentum. These findings enhance the understanding of soliton dynamics and offer insights for optimizing soliton excitation methods, with potential applications in straintronics and nonlinear wave control technologies.
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Received: 11 September 2024
Revised: 03 December 2024
Accepted manuscript online: 17 December 2024
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PACS:
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05.45.Yv
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(Solitons)
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63.20.Ry
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(Anharmonic lattice modes)
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Corresponding Authors:
Yi Ming
E-mail: yiming@ahu.edu.cn
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Cite this article:
Yi Ming(明燚) Excitation threshold of solitons in anharmonic chains 2025 Chin. Phys. B 34 020501
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