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A simple rule for finding Dirac cones in bilayered perovskites |
| Xuejiao Chen(陈雪娇)1,2, Lei Liu(刘雷)1, Dezhen Shen(申德振)1 |
1 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract A simple rule for finding Dirac cone electronic states in solids is proposed, which is neglecting those lattice atoms inert to particular electronic bands, and pursuing the two-dimensional (2D) graphene-like quasi-atom lattices with s- and p-bindings by considering the equivalent atom groups in the unit cell as quasi-atoms. Taking CsPbBr3 and Cs3Bi2Br9 bilayers as examples, we prove the effectiveness and generality of this rule with the density functional theory (DFT) calculations. We demonstrate that both bilayers have Dirac cones around the Fermi level and reveal that their corresponding Fermi velocities can reach as high as~0.2×106 m/s. This makes these new 2D layered materials very promising in making new ultra-fast ionic electronic devices.
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Received: 31 May 2019
Accepted manuscript online:
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PACS:
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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73.22.Pr
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(Electronic structure of graphene)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61525404). |
Corresponding Authors:
Lei Liu, Dezhen Shen
E-mail: liulei@ciomp.ac.cn;shendz@ciomp.ac.cn
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Cite this article:
Xuejiao Chen(陈雪娇), Lei Liu(刘雷), Dezhen Shen(申德振) A simple rule for finding Dirac cones in bilayered perovskites 2019 Chin. Phys. B 28 077106
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