Journal
PHYSICAL REVIEW B
Volume 89, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.195303
Keywords
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Funding
- DFG [FOR 960, SPP 1666]
- Helmholtz association [VI-521]
- Ministry of Education, Science, Sports and Culture Grant [25400317]
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Silicene, germanene, and stanene are two-dimensional topological insulators exhibiting helical edge states. We investigate global and local manipulations at the edges by exposing them to (i) a charge-density-wave order, (ii) a superconductor, (iii) an out-of-plane antiferromagnetic, and (iv) an in-plane antiferromagnetic field. We show that these perturbations affect the helical edge states in a different fashion. As a consequence one can realize quantum spin-Hall effect without edge states. In addition, these edge manipulations lead to very promising applications: a giant magnetoresistance and a perfect spin filter. We also investigate the effect of manipulations on a very few edge sites of a topological insulator nanodisk.
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