Excitation threshold of solitons in anharmonic chains  

作　　者：Yi Ming 明燚

机构地区：[1]School of Physics and Optoelectronics Engineering,Anhui University,Hefei 230601,China

出　　处：《Chinese Physics B》2025年第2期199-205,共7页中国物理B(英文版)

摘　　要：This study numerically estimates the momentum threshold required to excite solitons in anharmonic chains. For both Fermi–Pasta–Ulam–Tsingou(FPUT)-αβ and FPUT-β 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.

关 键 词：SOLITONS Fermi–Pasta–Ulam–Tsingou chains excitation threshold 

分 类 号：O41[理学—理论物理]