Hydrogen-induced tunable remanent polarization in a perovskite nickelate
| Autor: | Yuan, Yifan, Kotiuga, Michele, Park, Tae Joon, Ni, Yuanyuan, Saha, Arnob, Zhou, Hua, Sadowski, Jerzy T., Al-Mahboob, Abdullah, Yu, Haoming, Du, Kai, Zhu, Minning, Deng, Sunbin, Bisht, Ravindra S., Lyu, Xiao, Wu, Chung-Tse Michael, Ye, Peide D., Sengupta, Abhronil, Cheong, Sang-Wook, Xu, Xiaoshan, Rabe, Karin M., Ramanathan, Shriram |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Materials with field-tunable polarization are of broad interest to condensed matter sciences and solid-state device technologies. Here, using hydrogen (H) donor doping, we modify the room temperature metallic phase of a perovskite nickelate NdNiO3 into an insulating phase with both metastable dipolar polarization and space-charge polarization. We then demonstrate transient negative differential capacitance in thin film capacitors. The space-charge polarization caused by long-range movement and trapping of protons dominates when the electric field exceeds the threshold value. First-principles calculations suggest the polarization originates from the polar structure created by H doping. We find that polarization decays within ~1 second which is an interesting temporal regime for neuromorphic computing hardware design, and we implement the transient characteristics in a neural network to demonstrate unsupervised learning. These discoveries open new avenues for designing novel ferroelectric materials and electrets using light-ion doping. Comment: 13 pages, 5 figures |
| Databáze: | arXiv |
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