2020/03/05 by Lan Zhang, Hong-Gang Luo, Yin Zhong
Physics and Astronomy · #Antiferromagnetism #Electron #Fermi surface #Hexagonal lattice #Lattice (music) #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum tunnelling #Rare-earth and actinide compounds #Scanning tunneling microscope #Square lattice #Topological Materials and Phenomena #cond-mat.str-el
paper · pdf · doi:10.1088/1674-1056/ab8da4
published in Chinese Physics B 29(7), 077102 (IOP Publishing) · 7 pages, 10 figures
arxiv created 2020/03/05 · openalex publication_date 2020/04/28 · openalex created_date 2020/05/13 · arxiv updated 2020/06/11 · openalex updated_date 2026/08/05
Motivated by recent experimental progress on triangular lattice heavy-fermion compounds, we investigate possible Lifshitz transitions and the scanning tunnel microscope (STM) spectra of the Kondo–Heisenberg model on the triangular lattice. In the heavy Fermi liquid state, the introduced Heisenberg antiferromagnetic interaction ( J H ) results in the twice Lifshitz transition at the case of the nearest-neighbour electron hopping but with next-nearest-neighbour hole hopping and the case of the nearest-neighbour hole hopping but with next-nearest-neighbour electron hopping, respectively. Driven by J H , the Lifshitz transitions on triangular lattice are all continuous in contrast to the case on square lattice. Furthermore, the STM spectra shows rich line-shape which is influenced by the Kondo coupling J K , the Heisenberg antiferromagnetic interaction J H , and the ratio of the tunneling amplitude of f-electron t f versus conduction electron t c . Our work provides a possible scenario to understand the Fermi surface topology and the quantum critical point in heavy-fermion compounds.