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Defect energetics and magnetic properties of 3d-transition-metal-doped topological crystalline insulator SnTe
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作者 Na Wang JianFeng Wang +2 位作者 Chen Si Bing-Lin Gu WenHui Duan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第8期16-21,共6页
The introduction of magnetism in SnTe-class topological crystalline insulators is a challenging subject with great importance in the quantum device applications. Based on the first-principles calculations, we have stu... The introduction of magnetism in SnTe-class topological crystalline insulators is a challenging subject with great importance in the quantum device applications. Based on the first-principles calculations, we have studied the defect energetics and magnetic properties of 3d transition-metal(TM)-doped SnTe. We find that the doped TM atoms prefer to stay in the neutral states and have comparatively high formation energies, suggesting that the uniform TMdoping in SnTe with a higher concentration will be difficult unless clustering. In the dilute doping regime, all the magnetic TMatoms are in the high-spin states, indicating that the spin splitting energy of 3d TM is stronger than the crystal splitting energy of the SnTe ligand. Importantly, Mn-doped SnTe has relatively low defect formation energy, largest local magnetic moment, and no defect levels in the bulk gap, suggesting that Mn is a promising magnetic dopant to realize the magnetic order for the theoretically-proposed large-Chern-number quantum anomalous Hall effect(QAHE) in SnTe. 展开更多
关键词 topological crystalline insulator transition metal doping SnTe defect formation energy magnetic moment
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Growth of high-quality perovskite (110)-SrIrO_3 thin films using reactive molecular beam epitaxy
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作者 Kai-Li Zhang Cong-Cong Fan +6 位作者 Wan-Ling Liu Yv -Feng Wu Xiang-Le Lu Zheng-Tai Liu Ji-Shan Liu Zhong-Hao Liu Da-Wei Shen 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第8期578-581,共4页
Recently, 5d transition metal iridates have been reported as promising materials for the manttfacture of exotic quan- tum states. Apart from the semimetallic ground states that have been observed, perovskite SrlrO3 is... Recently, 5d transition metal iridates have been reported as promising materials for the manttfacture of exotic quan- tum states. Apart from the semimetallic ground states that have been observed, perovskite SrlrO3 is also predicted to have a lattice-symmetrically protected topological state in the (110) plane due to its strong: spin-orbil coupling and electron correlation. Compared with non-polar (001)-SflrO3, the especial polarity of (110)-SrIrC)3 undoubtedly adds the: difficulty of fabrication and largely impedes the research on its surface states. Here, we have successfully synthesized high-quality (110)-SflrO3 thin films on (110)-SrTiO3 substrates by reactive molecular beam epitaxy fi^r the first time. Both reflec- tion high-energy electron diffraction pattems and x-ray diffraction measurements suggest the expected orientation and outstanding crystallinity. A (1 × 2) surface reconstruction driven from the surface instabiJity, the. same as that reported in (110)-SrTiO3, is observed. The electric transport measurements uncover that (110)-SrIrO3 exhibits a more prominent semimetallic property in comparison to (001)-SrIrO3. 展开更多
关键词 molecular beam epitaxy iridates topological crystalline metal sunace reconstruction
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