Wang Jianjin, He Dahai, Zhang Yong, Wang Jiao, Zhao Hong
Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, Fujian, China.
Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen 361005, Fujian, China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2015 Sep;92(3):032138. doi: 10.1103/PhysRevE.92.032138. Epub 2015 Sep 28.
We study effects of interaction symmetry in one-dimensional, momentum-conserving disordered lattices. It is found that asymmetric and symmetric interparticle interactions may result in significant difference: localized modes can be delocalized by very weak asymmetric interactions but survive much stronger symmetric interactions. Moreover, in the delocalization regime, asymmetric and symmetric interactions also have qualitatively different effects on transport: the former (the latter) may lead to a fast decaying (slow power-law decaying) heat current correlation function and in turn a convergent (divergent) heat conductivity. A method for detecting delocalization in systems at a nonzero temperature is proposed as well.
我们研究了一维、动量守恒无序晶格中相互作用对称性的影响。结果发现，非对称和对称的粒子间相互作用可能会导致显著差异：局域模可以通过非常弱的非对称相互作用而退局域化，但能在强得多的对称相互作用下存活。此外，在退局域化区域，非对称和对称相互作用对输运也有定性不同的影响：前者（后者）可能导致热流关联函数快速衰减（缓慢幂律衰减），进而导致热导率收敛（发散）。还提出了一种在非零温度系统中检测退局域化的方法。
