期刊
NATURE PHYSICS
卷 7, 期 1, 页码 32-37出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1838
关键词
-
资金
- Basic Energy Sciences of the US DOE [DE-FG-02-05ER46200, AC03-76SF00098, DE-FG02-07ER46352]
- NSF [DMR-0819860, DMR-1006492]
Topological insulators embody a state of bulk matter characterized by spin-momentum-locked surface states that span the bulk bandgap(1-7). This highly unusual surface spin environment provides a rich ground for uncovering new phenomena(4-24). Understanding the response of a topological surface to strong Coulomb perturbations represents a frontier in discovering the interacting and emergent many-body physics of topological surfaces. Here we present the first controlled study of topological insulator surfaces under Coulomb and magnetic perturbations. We have used time-resolved deposition of iron, with a large Coulomb charge and significant magnetic moment, to systematically modify the topological spin structure of the Bi2Se3 surface. We observe that such perturbation leads to the creation of odd multiples of Dirac fermions and that magnetic interactions break time-reversal symmetry in the presence of band hybridizations. We present a theoretical model to account for the observed electron dynamics of the topological surface. Taken collectively, these results are a critical guide in controlling electron mobility and quantum behaviour of topological surfaces, not only for device applications but also in setting the stage for creating exotic particles such as axions or imaging monopoles on the surface.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据