Institute for Advanced Study, Tsinghua University, Beijing 100084, China.
Department of Physics, Stanford University, Stanford, California 94025, USA.
Phys Rev Lett. 2015 Aug 14;115(7):076802. doi: 10.1103/PhysRevLett.115.076802. Epub 2015 Aug 13.
We study dynamical mass generation and the resultant helical spin orders in topological Dirac and Weyl semimetals, including the edge states of quantum spin Hall insulators, the surface states of weak topological insulators, and the bulk materials of Weyl semimetals. In particular, the helical spin textures of Weyl semimetals manifest the spin-momentum locking of Weyl fermions in a visible manner. The spin-wave fluctuations of the helical order carry electric charge density; therefore, the spin textures can be electrically controlled in a simple and predictable manner.
我们研究了拓扑狄拉克和外尔半金属中的动力学质量生成和由此产生的螺旋自旋有序，包括量子自旋霍尔绝缘体的边缘态、弱拓扑绝缘体的表面态和外尔半金属的体材料。特别是，外尔半金属的螺旋自旋织构以可见的方式表现出外尔费米子的自旋-动量锁定。螺旋有序的自旋波涨落携带电荷密度；因此，自旋织构可以以简单且可预测的方式进行电控制。
