Controlling heat flows among three reservoirs asymmetrically coupled to two two-level systems
Controlling heat flows among three reservoirs asymmetrically coupled to two two-level systems
复制标题
控制与两个两级系统不对称耦合的三个储层之间的热流
DOI：
10.1103/physreve.94.042135
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
Yun-Jie Xia
中科院分区：
文献类型：
--
作者：
Zhong-Xiao Man;Nguyen Ba An;Yun-Jie Xia
本文研究了两个二能级系统中三个热库之间的热流。两个储存器耦合到一个TLS，并且第三储存器耦合到第二TLS。这两个TLS也彼此耦合，从而将第三储液器与另外两个储液器桥接。我们表明，水库的热流的大小和方向可以通过改变不同的阻尼率的两个TLS由于耦合到相应的水库。首先，研究表明，通过改变一个储层的阻尼率，其他两个储层的热流大小可以以完全不同的方式表现，即，尽管一个储层可以被增强，但另一个储层可以被抑制，反之亦然。第二，一个储层的热流的符号可能改变（即，如果阻尼率或两个TLS之间的耦合强度扫过临界值，这取决于三个储存器的温度设置，则会发生从吸热到放热的交叉，反之亦然。由于两个TLS与三个储层的不对称耦合，热整流发生而不会向系统引入任何额外的不对称性。
We study heat flows among three thermal reservoirs via two two-level systems (TLSs). Two reservoirs are coupled to one TLS and the third reservoir to the second TLS. The two TLSs are also coupled to each other, thus bridging the third reservoir with the two other reservoirs. We show that the magnitudes and directions of the reservoirs' heat currents can be controlled by varying the various damping rates of the two TLSs due to coupling with the corresponding reservoirs. First, it is shown that by changing the damping rate due to one reservoir, magnitudes of heat currents of the other two reservoirs can behave in completely different manners, namely, although one may be enhanced, the other may instead be suppressed, and vice versa. Second, the sign of the heat current of one reservoir may change (i.e., crossover from heat absorption to heat release, or vice versa) if a damping rate or the coupling strength between the two TLSs is swept through a critical value, which depends on the temperature settings for the three reservoirs. Due to the asymmetric couplings of the two TLSs to the three reservoirs, the thermal rectification occurs without introducing any additional asymmetry to the systems.