A novel quasi-one-dimensional topological insulator theoretically predicted and experimentally confirmed by the team of Oleg V. Yazyev
This was published on December 21, 2015
![Topological surface states in bismuth iodide as seen by angle-resolved photoemission spectroscopy](https://nccr-marvel.ch/_Resources/Persistent/cd15235db7916743bba1dbfb6c95d59f3d1ad752/Yazyev-nat15-fig-600x400.jpg)
Topological surface states in bismuth iodide as seen by angle-resolved photoemission spectroscopy
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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