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A pressure-induced topological phase with large Berry curvature in Pb1-x Sn x Te.


ABSTRACT: The picture of how a gap closes in a semiconductor has been radically transformed by topological concepts. Instead of the gap closing and immediately reopening, topological arguments predict that, in the absence of inversion symmetry, a metallic phase protected by Weyl nodes persists over a finite interval of the tuning parameter (for example, pressure P). The gap reappears when the Weyl nodes mutually annihilate. We report evidence that Pb1-x Sn x Te exhibits this topological metallic phase. Using pressure to tune the gap, we have tracked the nucleation of a Fermi surface droplet that rapidly grows in volume with P. In the metallic state, we observe a large Berry curvature, which dominates the Hall effect. Moreover, a giant negative magnetoresistance is observed in the insulating side of phase boundaries, in accord with ab initio calculations. The results confirm the existence of a topological metallic phase over a finite pressure interval.

SUBMITTER: Liang T 

PROVIDER: S-EPMC5451193 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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A pressure-induced topological phase with large Berry curvature in Pb<sub>1-<i>x</i></sub> Sn <sub><i>x</i></sub> Te.

Liang Tian T   Kushwaha Satya S   Kim Jinwoong J   Gibson Quinn Q   Lin Jingjing J   Kioussis Nicholas N   Cava Robert J RJ   Ong N Phuan NP  

Science advances 20170531 5


The picture of how a gap closes in a semiconductor has been radically transformed by topological concepts. Instead of the gap closing and immediately reopening, topological arguments predict that, in the absence of inversion symmetry, a metallic phase protected by Weyl nodes persists over a finite interval of the tuning parameter (for example, pressure <i>P</i>). The gap reappears when the Weyl nodes mutually annihilate. We report evidence that Pb<sub>1-<i>x</i></sub> Sn <sub><i>x</i></sub> Te e  ...[more]

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