Topological insulator to Dirac semimetal transition driven by sign change of spin-orbit coupling in thallium nitride
Based on the first-principles calculations, we reveal that TIN, a simple binary compound with wurtzite structure, is a three-dimensional (3D) topological insulator (TI) with effectively negative spin-orbit coupling [lambda] sub(eff) < 0, which makes it distinguished from other TIs by showing oppo...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-12, Vol.90 (24), Article 245308 |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Sheng, Xian-Lei Wang, Zhijun Yu, Rui Weng, Hongming Fang, Zhong Dai, Xi |
| description | Based on the first-principles calculations, we reveal that TIN, a simple binary compound with wurtzite structure, is a three-dimensional (3D) topological insulator (TI) with effectively negative spin-orbit coupling [lambda] sub(eff) < 0, which makes it distinguished from other TIs by showing opposite spin-momentum locking effect in its surface states. The sign of [lambda] sub(eff) depends on the hybridization between N-2p and TI-5d states, and can be tuned from negative to positive by lattice strain or chemical substitution, which drives the system into a Dirac semimetal with 3D Dirac cones in its bulk states. Such topological phase transition can be realized by electronic mechanism without breaking any crystal symmetry. |
| doi_str_mv | 10.1103/PhysRevB.90.245308 |
| format | Article |
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| source | American Physical Society Journals |
| subjects | Condensed matter Electronics Insulators Metalloids Spin-orbit interactions Three dimensional Topology Wurtzite |
| title | Topological insulator to Dirac semimetal transition driven by sign change of spin-orbit coupling in thallium nitride |
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