论文标题
镍在Cu上的拓扑量子相变（100）
Topological quantum phase transition of nickelocene on Cu(100)
论文作者
论文摘要
理论上已经在几个磁性纳米系统中提出了由近多相关性驱动的局部量子相变。但是，明确的实验签名很少。 Modeling a nickelocene molecule on a Cu(100) substrate as a two-orbital Anderson impurity with single-ion easy-plane anisotropy coupled to two conduction bands, we find that recent scanning tunneling spectra measured at different microscope tip heights reveal the existence of a topological quantum phase transition from the usual local Fermi liquid with high zero-bias conductance to a non-Landau Fermi液体，其特征是非平凡的量化Luttinger积分，具有较小的电导。中等价，有限温度和分子位置的结构松弛的影响使我们能够解释不同观察到的行为。
Local quantum phase transitions driven by Kondo correlations have been theoretically proposed in several magnetic nanosystems; however, clear experimental signatures are scant. Modeling a nickelocene molecule on a Cu(100) substrate as a two-orbital Anderson impurity with single-ion easy-plane anisotropy coupled to two conduction bands, we find that recent scanning tunneling spectra measured at different microscope tip heights reveal the existence of a topological quantum phase transition from the usual local Fermi liquid with high zero-bias conductance to a non-Landau Fermi liquid, characterized by a non-trivial quantized Luttinger integral, with a small conductance. The effects of intermediate valence, finite temperature, and structural relaxation of the molecule position allow us to explain the different observed behaviors.
