Interaction between in-gap states and carriers at the conductive interface between perovskite oxides
| Autor: | Jia-Cai Nie, Rui-Fen Dou, Jianchao Meng, Weimin Jiang, Zhe Zhang, Hongxia Xue, Kejian Liu, Yanpeng Hong, Cheng-Jian Li, Mingrui Liu, Lin He, Changmin Xiong, Yongchun Li |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed matter physics Carrier scattering Scattering Screening effect Heterojunction 02 engineering and technology Electron Conductivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology Electrical conductor Perovskite (structure) |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 30(40) |
| ISSN: | 1361-648X |
| Popis: | The 2D electron systems of SrTiO3/NdGaO3 (STO/NGO) and amorphous-LaAlO3/SrTiO3/NdGaO3 (a-LAO/STO/NGO) heterojunctions were explored. An obvious interaction between in-gap states (IGSs) and carriers was found. The IGSs can trap a large number of carriers and enhance carrier scattering. As a result of the high density of IGSs in STO, the conductivity of STO/NGO was severely weakened. However, for a-LAO/STO/NGO heterojunctions, the high carrier density can reduce the effect of IGSs through the electrostatic screening effect. The competition between IGSs and the screening effect of carriers results in an insulator-metal transition and a strange temperature dependence of carrier density. We also explored the interaction between IGSs and carriers theoretically. A mathematical description was proposed and the calculated results showed good agreement with experimental findings. |
| Databáze: | OpenAIRE |
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