Balachandran Vinitha, Clark Stephen R, Goold John, Poletti Dario
Science and Math Cluster and EPD Pillar, Singapore University of Technology and Design, 8 Somapah Road, 487372 Singapore.
H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom.
Phys Rev Lett. 2019 Jul 12;123(2):020603. doi: 10.1103/PhysRevLett.123.020603.
We investigate how the presence of a single-particle mobility edge in a system can generate strong energy current rectification. Specifically, we study a quadratic bosonic chain subject to a quasiperiodic potential and coupled at its boundaries to spin baths of differing temperature. We find that rectification increases by orders of magnitude depending on the spatial position in the chain of localized eigenstates above the mobility edge. The largest enhancements occur when the coupling of one bath to the system is dominated by a localized eigenstate, while the other bath couples to numerous delocalized eigenstates. By tuning the parameters of the quasiperiodic potential it is thus possible to vary the amplitude, and even invert the direction, of the rectification.
我们研究了系统中单个粒子迁移率边缘的存在如何产生强能量电流整流。具体而言，我们研究了一个受准周期势作用且在其边界处耦合到不同温度自旋浴场的二次玻色子链。我们发现，整流会根据迁移率边缘上方局域本征态在链中的空间位置而增加几个数量级。当一个浴场与系统的耦合由一个局域本征态主导，而另一个浴场与许多离域本征态耦合时，增强效果最为显著。因此，通过调整准周期势的参数，可以改变整流的幅度，甚至反转其方向。
