A joint theoretical-experimental work led to the discovery of a novel topological insulator phase in the binary bismuth iodide, beta-Bi4I4.
The electronic structure calculations (DFT and GW) and the angle-resolved photoemission spectroscopy measurements revealed a highly anisotropic band-crossing feature. The resistivity measurements confirmed the small band gap in this compound. The work has been published on Nature Materials (2015).
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