Journal
PHYSICAL REVIEW B
Volume 91, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.235102
Keywords
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Education [2014R1A1A2057202, 2013R1A6A3A01064947]
- National Institute of Supercomputing and Networking/Korea Institute of Science and Technology Information [KSC-2014-C3-050]
- National Research Foundation of Korea [2014R1A1A2057202, 2013R1A6A3A01064947] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Using first-principles density functional theory calculations, we investigated the effect of charge doping in a LaNiO3/SrTiO3 superlattice. The detailed analysis based on two different doping simulation methods clearly shows that the electronic and structural properties change in a systematic way, and that the orbital polarization (i.e., relative occupation of two Ni-e(g) orbitals) is reduced and the Ni to apical oxygen distance is enlarged as the number of doped electrons increases. Also, the rotation angles of the NiO6/TiO6 octahedra strongly and systematically depend on the doping. Our results not only suggest a possible way to control the orbital and structural properties by means of charge doping, but also provide useful information for understanding experiments under various doping situations such as oxygen vacancy.
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