选择性原子梯度实现协同极性态

Sanghyeon Kim1†, Gi- Jeong Han1†, Soo- Yoon Hwang2†‡, Gahee Noh2†§, P. Karuna Kumari3, Kihwan Lee4, Min Seop Kim4, Jiyong Yoon1, Jong Seok Lee4, Se Young Park3,5*, Si- Young Choi2,6,7*, Gil- Ho Lee1*, Daesu Lee1* Materials that combine distinct properties within a single phase are of fundamental and technological interest. Here, we present a broadly applicable strategy to achieve strong bulk polarity that not only coexists with its originally incompatible properties, such as metallicity, but also synergistically enables exceptional functionalities. A combination of thin- film synthesis, atomicscale imaging, and theoretical calculations reveals that A- site selective atomic gradients induce strong polar states in otherwise centrosymmetric perovskite oxides AbO3. …