Theoretical research for novel physics of spin Hall effects on the system surfaces and interfaces

我们计算了拓扑绝缘体的热电性质。对于二维拓扑绝缘体，随着温度的降低，边缘态输运优于体态输运。我们还得到了描述拓扑绝缘子和普通绝缘子之间相变的通用相图。最后，我们用第一性原理方法计算了铂的自旋霍尔电导率，并证明了铂中的巨大自旋霍尔效应是由费米能量附近的带交叉引起的。

We calculate thermoelectric properties of the topological insulators. For two-dimensional topological insulators, as the temperature is lowered, the edge-state transport becomes dominant over the bulk transport. We also obtain universal phase diagrams describing the phase transitions between the topological and ordinary insulators. Lastly, we calculate the spin Hall conductivity for platinum by first-principle methods, and show that the giant spin Hall effect in platinum is caused by the band crossings near the Fermi energy.