Iubini Stefano, Borlenghi Simone, Delin Anna, Lepri Stefano, Piazza Francesco
Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy.
Dipartimento di Fisica e Astronomia, Università di Padova, via F. Marzolo 8 I-35131, Padova, Italy.
Entropy (Basel). 2020 Feb 13;22(2):210. doi: 10.3390/e22020210.
Transport phenomena are ubiquitous in physics, and it is generally understood that the environmental disorder and noise deteriorates the transfer of excitations. There are, however, cases in which transport can be enhanced by fluctuations. In the present work, we show, by means of micromagnetics simulations, that transport efficiency in a chain of classical macrospins can be greatly increased by an optimal level of dephasing noise. We also demonstrate the same effect in a simplified model, the dissipative Discrete Nonlinear Schrödinger equation, subject to phase noise. Our results point towards the realization of a large class of magnonics and spintronics devices, where disorder and noise can be used to enhance spin-dependent transport efficiency.
输运现象在物理学中无处不在，人们普遍认为环境无序和噪声会降低激发的传递。然而，在某些情况下，涨落可以增强输运。在本工作中，我们通过微磁模拟表明，通过最优水平的退相噪声，经典宏观自旋链中的输运效率可以大大提高。我们还在一个简化模型——受相位噪声影响的耗散离散非线性薛定谔方程中证明了同样的效应。我们的结果表明，一大类磁振子学和自旋电子学器件有望实现，其中无序和噪声可用于提高自旋相关的输运效率。
