Žitko R, Blesio G G, Manuel L O, Aligia A A
Jožef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia.
Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000, Ljubljana, Slovenia.
Nat Commun. 2021 Oct 15;12(1):6027. doi: 10.1038/s41467-021-26339-z.
The paradigm of Landau's Fermi liquid theory has been challenged with the finding of a strongly interacting Fermi liquid that cannot be adiabatically connected to a non-interacting system. A spin-1 two-channel Kondo impurity with anisotropy D has a quantum phase transition between two topologically different Fermi liquids with a peak (dip) in the Fermi level for D < D (D > D). Extending this theory to general multi-orbital problems with finite magnetic field, we reinterpret in a unified and consistent fashion several experimental studies of iron phthalocyanine molecules on Au(111) that were previously described in disconnected and conflicting ways. The differential conductance shows a zero-bias dip that widens when the molecule is lifted from the surface (reducing the Kondo couplings) and is transformed continuously into a peak under an applied magnetic field. We reproduce all features and propose an experiment to induce the topological transition.
朗道费米液体理论的范式受到了挑战，因为发现了一种强相互作用费米液体，它不能绝热地连接到非相互作用系统。具有各向异性D的自旋-1双通道近藤杂质在两个拓扑不同的费米液体之间存在量子相变，当D < D（D > D）时，费米能级出现峰值（谷值）。将该理论扩展到具有有限磁场的一般多轨道问题，我们以统一且一致的方式重新解释了此前以不连贯且相互矛盾的方式描述的关于金（111）表面铁酞菁分子的几项实验研究。微分电导显示出一个零偏压谷值，当分子从表面抬起时（减小近藤耦合）该谷值变宽，并在施加磁场时连续转变为一个峰值。我们重现了所有特征，并提出了一个诱导拓扑转变的实验。
