物理
非线性系统
位置和动量空间
拓扑(电路)
格子(音乐)
空格(标点符号)
孤子
相空间
量子力学
数学
声学
语言学
组合数学
哲学
作者
Thomas Tuloup,Raditya Weda Bomantara,Ching Hua Lee,Jiangbin Gong
出处
期刊:Physical review
[American Physical Society]
日期:2020-09-11
卷期号:102 (11)
被引量:62
标识
DOI:10.1103/physrevb.102.115411
摘要
Nonlinearity induced topological properties in nonlinear lattice systems are studied in both momentum space and real space. Experimentally realizable through the Kerr effect on photonic waveguide systems, our working model depicts onsite nonlinearity added to the Su-Schrieffer-Heeger (SSH) model plus a chiral-symmetry-breaking term. Under the periodic boundary condition, two of the nonlinear energy bands approach the energy bands of the chiral-symmetric SSH model as nonlinearity strength increases. Further, we account for a correction to the Zak phase and obtain a general expression for nonlinear Zak phases. For sufficiently strong nonlinearity, the sum of all nonlinear Zak phases (not the sum of all conventional Zak phases) is found to be quantized. In real space, it is discovered that there is a strong interplay between nonlinear solitons and the topologically protected edge states of the associated chiral-symmetric linear system. Nonlinearity can recover the degeneracy between two edge soliton states, albeit a chiral-symmetry-breaking term. We also reveal the topological origin of in-gap solitons even when the associated linear system is in the topological trivial regime. These momentum-space and real-space results have clearly demonstrated new topological features induced by nonlinearity, indicating that topological physics in nonlinear lattice systems is far richer than previously thought.
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