耦合三端子量子点系统中Andreev反射调控的热电输运

基金项目:

国家自然科学基金项目;新世纪优秀人才项目

详细信息

ANDREEV REFLECTION MODULATED THERMOELECTRIC TRANSPORT IN A THREE TERMINAL QUANTUM DOT

摘要: 以耦合到超导电极、铁磁金属电极及正常金属电极的三端子量子点混杂系统为研究对象，系统研究了自旋极化电子的Andreev反射过程对热电流的影响.研究发现，Andreev反射过程及正常的隧穿过程两种机制的竞争不仅导致热电荷流大小和方向的改变，而且导致热自旋流大小和方向的改变.实验上可通过调控门电压及超导体与量子点耦合强度来实现.
- 热电输运
Abstract: The influence of spin-polarized electronic transports associated with Andreev reflection on the thermoelectric currents is investigated in a three-terminal hybridized system, consisting of an interacting quantum dot tunnel coupled to one superconducting, one ferromagnetic, and one normal lead. The numerical results show that the competition between the Andreev reflection and normal tunneling leads to the changes in the magnitude and direction of both thermal charge current and thermal spin current. Experimentally, it can be realized by modulating the gate voltage and the coupling strength between the superconducting lead and quantum dot.
- thermoelectric transport