Spin thermoelectricity in dualhydrogenated zigzag silicene nanoribbons with surface adsorptions

Publication date: Available online 9 May 2019Source: Physics Letters AAuthor(s): Yushen Liu, Xiaoshuang Chen, Xifeng YangAbstractThe buckled structure of silicene provides a feasible pathway to influence its electric and magnetic properties via surface adsorptions. Here, we investigate the magnetic and spin thermoelectric transport properties of dual-hydrogenated zigzag silicene nanoribbons (ZSiNRs) without/with the hydrogen adsorption. The band gaps for two spin channels in ZSiNRs under the hydrogen adsorption are shifted near the Fermi level, leading to the appearance of spin Seebeck effect. Using a temperature difference, one can derive the carriers with the different spin index to flow in the opposite direction. Moreover, a large rectification ratio close to 105 at room temperature is achieved for the spin current, and the charge current exhibits a remarkable negative differential thermoelectric resistance (NDTR) behavior. The results presented here are fascinating potential applications in the fields of silicon-based spin caloritronic devices.

Source: Physics Letters A - May 10, 2019 Category: Physics Source Type: research