Department of Physics, University of California-San Diego, La Jolla, California 92093, USA.
Phys Rev Lett. 2011 Oct 21;107(17):176401. doi: 10.1103/PhysRevLett.107.176401. Epub 2011 Oct 17.
An optical study of NdNiO(3) ultrathin films with insulating and metallic ground states reveals new aspects of the insulator-to-metal transition that point to Mott physics as the driving force. In contrast with the behavior of charge-ordered systems, we find that the emergence of the Drude resonance across the transition is linked to a spectral weight transfer over an energy range of the order of the Coulomb repulsion U, as the energy gap is filled with states instead of closing continuously.
对具有绝缘和金属基态的 NdNiO(3) 超薄薄膜进行的光学研究揭示了绝缘-金属转变的新方面，表明莫特物理是驱动力。与电荷有序系统的行为相反，我们发现，在转变过程中 Drude 共振的出现与在库仑排斥 U 量级的能量范围内的光谱权重转移有关，因为能隙被填充而不是连续关闭。
