Spin-polarized two-dimensional electron/hole gases on LiCoO$_2$ layers.
First-principles calculations show the formation of a 2D spin polarized electron (hole) gas on the Li (CoO$_2$) terminated surfaces of finite slabs down to a monolayer, in remarkable contrast with the bulk band structure, which is stabilized by Li donating its electron to the CoO$_2$ layer forming...
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| Format: | Article |
| Language: | English |
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SciPost
2021-03-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.10.3.057 |
| Summary: | First-principles calculations show the formation of a 2D spin polarized electron (hole) gas on the Li (CoO$_2$) terminated surfaces of finite slabs down to a monolayer, in remarkable contrast with the bulk band structure, which is stabilized by Li donating its electron to the CoO$_2$ layer forming a Co-$d-t_{2g}^6$ insulator. By mapping the first-principles computational results to a minimal tight-binding models corresponding to a non-chiral 3D generalization of the quadripartite Su-Schrieffer-Heeger (SSH4) model and symmetry analysis, we show that these surface states have topological origin. |
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| ISSN: | 2542-4653 |