Experimental verification of PbBi$_{2}$Te$_{4}$ as a 3D topological insulator

Details Experimental verification of PbBi$_{2}$Te$_{4}$ as a 3D topological insulator Experimental verification of PbBi$_{2}$Te$_{4}$ as a 3D topological insulator

2011-11-24

arxiv.org/abs/1111.5730v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

The first experimental evidence is presented of the topological insulator state in PbBi$_{2}$Te$_{4}$. A single surface Dirac cone is observed by angle-resolved photoemission spectroscopy (ARPES) with synchrotron radiation. Topological invariants $\mathbb{Z}_2$ are calculated from the {\it ab initio} band structure to be 1; (111). The observed two-dimensional iso-energy contours in the bulk energy gap are found to be the largest among the known three-dimensional topological insulators. This opens a pathway to achieving a sufficiently large spin current density in future spintronic devices.

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