期刊
PHYSICAL REVIEW B
卷 82, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.041104
关键词
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资金
- NSERC
- CIfAR
- China Scholarship Council
An infinitely thin solenoid carrying magnetic flux Phi (a Dirac string) inserted into an ordinary band insulator has no significant effect on the spectrum of electrons. In a strong topological insulator, remarkably, such a solenoid carries protected gapless one-dimensional fermionic modes when Phi = hc/2e. These modes are spin-filtered and represent a distinct bulk manifestation of the topologically nontrivial insulator. We establish this wormhole effect by both general qualitative considerations and by numerical calculations within a minimal lattice model. We also discuss the possibility of experimental observation of a closely related effect in artificially engineered nanostructures.
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