论文标题
由量子点中库仑相互作用驱动的热传输：热电和热电流的增强
Thermal transport driven by Coulomb interactions in quantum dots: Enhancement of thermoelectric and heat currents
论文作者
论文摘要
我们研究了串行的不对称双量子点（DQD）中的热传输，该量子点（DQD）与两个具有不同温度的电子储层结合在一起。在库仑封锁DQD中考虑了库仑间相互作用和内部内部相互作用，其中考虑了通过四种不同的主方程方法的电子顺序隧道。在没有库仑相互作用的情况下，发现发现可忽视的热电和热电流将其识别为库仑封锁DQD制度。在存在库仑相互作用的情况下，观察到内部和点间多体电子状态之间的交叉能量。十字路口在DQD的能量谱中诱导额外的通道，从而增强热电和热电流。额外的通道在热电和热电流中形成几个峰，其中峰的强度和位置取决于库仑间和点内库仑相互作用的强度。此外，使用对主方程的不同方法研究了连贯和不连贯的问题，这是第一阶Von-Neumann，Redfield，一阶Lindblad和Pauli方法。我们发现，当相干的作用与DQD无关时，所有方法几乎都会产生相似的热传输。
We investigate thermal transport in a serial asymmetric double quantum dot (DQD) coupled to two electron reservoirs with different temperatures. The inter- and intra-Coulomb interactions are taken into account in a Coulomb blockade DQD where the electron sequential tunneling via four different master equation approaches is considered. In the absence of Coulomb interactions, a neglectable thermoelectric and heat currents is found identifying as the Coulomb blockade DQD regime. In the presence of Coulomb interactions, intra- and inter-Coulomb interactions, crossings energies between the intra- and the inter-dot many-body electron states are observed. The crossings induce extra channels in the energy spectrum of the DQD that enhance thermoelectric and heat currents. The extra channels form several peaks in the thermoelectric and heat currents in which intensity and position of the peaks depend on strength of the inter- and intra-dot Coulomb interactions. In addition, the problem of coherences and incoherences are studied using different approaches to the master equation, which are the first order von-Neumann, the Redfield, a first order Lindblad, and the Pauli methods. We find that all methods give almost similar thermal transport when the role of the coherences is irrelevant in the DQD.
