热电性质中的自旋相关拍频模式：近藤吸附原子系统中热通量的载流子过滤
Spin-dependent beating patterns in thermoelectric properties: Filtering the carriers of the heat flux in a Kondo adatom system
摘要：
我们从理论上研究了自旋极化二维电子气中近藤吸附原子与STM针尖杂交的热电性质。这样的设置内的单杂质安德森模型结合原子方法的格林函数。由于费米波数的自旋依赖性的电导和热导，连同热电势和洛伦兹数揭示作为STM尖端位置的函数在近藤制度的拍频图案。特别是，通过调整相对于吸附原子附近的尖端的横向位移，温度和吸附原子水平的位置，可以通过电荷和自旋改变塞贝克系数的符号。这开启了类似于为电流建立的热通量的微观控制的可能性。
英文摘要：
We theoretically investigate the thermoelectric properties of a spin-polarized two-dimensional electron gas hosting a Kondo adatom hybridized with an STM tip. Such a setup is treated within the single-impurity Anderson model in combination with the atomic approach for the Green's functions. Due to the spin dependence of the Fermi wavenumbers the electrical and thermal conductances, together with thermopower and Lorenz number reveal beating patterns as function of the STM tip position in the Kondo regime. In particular, by tuning the lateral displacement of the tip with respect to the adatom vicinity, the temperature and the position of the adatom level, one can change the sign of the Seebeck coefficient through charge and spin. This opens a possibility of the microscopic control of the heat flux analogously to that established for the electrical current.
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