Article abstract
Nature Physics 5, 298 - 303 (2009)
Published online: 8 March 2009 | doi:10.1038/nphys1220
Subject Categories: Condensed-matter physics | Information theory and computation
One-dimensional topologically protected modes in topological insulators with lattice dislocations
Ying Ran1,2, Yi Zhang1 & Ashvin Vishwanath1,2
Abstract
Topological defects, such as domain walls and vortices, have long fascinated physicists. A novel twist is added in quantum systems such as the B-phase of superfluid helium He3, where vortices are associated with low-energy excitations in the cores. Similarly, cosmic strings may be tied to propagating fermion modes. Can analogous phenomena occur in crystalline solids that host a plethora of topological defects? Here, we show that indeed dislocation lines are associated with one-dimensional fermionic excitations in a 'topological insulator', a novel phase of matter believed to be realized in the material Bi0.9Sb0.1. In contrast to fermionic excitations in a regular quantum wire, these modes are topologically protected and not scattered by disorder. As dislocations are ubiquitous in real materials, these excitations could dominate spin and charge transport in topological insulators. Our results provide a novel route to creating a potentially ideal quantum wire in a bulk solid.
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Correspondence to: Ying Ran1,2 e-mail: ranying@berkeley.edu
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