Falcão P R N, Lyra M L
Instituto de Física, Universidade Federal de Alagoas 57072-970 Maceió-AL, Brazil.
J Phys Condens Matter. 2020 Jun 3;32(24):245401. doi: 10.1088/1361-648X/ab7a0f.
The scattering of acoustic phonons by nonreciprocal spring defects inserted in an harmonic chain is investigated. The degree of nonreciprocity of the forces mediated by the defect springs is parameterized by a single quantity Δ that effectively takes into account the interaction of the coupled masses with hidden degrees of freedom of an underlying nonequilibrium system. We demonstrate a pronounced rectification effect with transmission having a preferential direction. Nonreciprocity also allows energy exchange between the system and the medium. Further, we show a cooperative action between defects mediated by resonant cavity modes. The influence of damping forces is also explored and shown to promote the rectification of the reflected vibrational wave component.
研究了插入谐波链中的非互易弹簧缺陷对声子的散射。缺陷弹簧介导的力的非互易程度由单个量Δ参数化，该量有效地考虑了耦合质量与潜在非平衡系统隐藏自由度的相互作用。我们证明了具有优先方向传输的显著整流效应。非互易性还允许系统与介质之间进行能量交换。此外，我们展示了由共振腔模式介导的缺陷之间的协同作用。还探讨了阻尼力的影响，并表明其促进了反射振动波分量的整流。
