关键词: 复杂氧化物/
电子相分离/
量子调控/
自旋电子器件
English Abstract
Quantum manipulation of electronic phase separation in complex oxides
Wang Wen-Bin1,Zhu Yin-Yan2,
Yin Li-Feng2,3,
Shen Jian1,2,3
1.Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China;
2.State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China;
3.Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
Fund Project:Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300702), the National Basic Research Program of China (Grant No. 2014CB921104), the National Natural Science Foundation of China (Grant No. 11504053), the Program of Shanghai Academic Research Leader, China (Grant Nos. 18XD1400600, 17XD1400400), and Shanghai Municipal Natural Science Foundation, China (Grant Nos. 18JC1411400, 18ZR1403200).Received Date:12 November 2018
Accepted Date:19 November 2018
Published Online:20 November 2019
Abstract:Complex oxides system displays exotic properties such as high temperature superconductivity, colossal magnetoresistance and multiferroics. Owing to the strong correlation between lattice, spin, charge and orbital degrees of freedom, competing electronic states in complex oxides system often have close energy scales leading to rich phase diagrams and spatial coexistence of different electronic phases known as electronic phase separation (EPS). When the dimension of complex oxides system is reduced to the length scale of the correlation length of the EPS, one would expect fundamental changes of the correlated behavior. This offers a way to control the physical properties in the EPS system. In this paper, we review our recent works on electronic phase separation in complex oxide systems. We discovered a pronounced ferromagnetic edge state in manganite strips; by using lithographic techniques, we also fabricated antidot arrays in manganite, which show strongly enhanced metal-insulator transition temperature and reduced resistance. Moreover, we discovered a spatial confinement-induced transition from an EPS state featuring coexistence of ferromagnetic metallic and charge order insulating phases to a single ferromagnetic metallic state in manganite. In addition, by using unit cell by unit cell superlattice growth technique, we determined the role of chemical ordering of the dopant in manganite. We show that spatial distribution of the chemical dopants has strong influence on their EPS and physical properties. These works open a new way to manipulate EPS and thus the global physical properties of the complex oxides systems, which is potentially useful for oxides electronic and spintronic device applications.
Keywords: complex oxides system/
electronic phase separation/
quantum manipulation/
spintronic device
