2004/06/16 by A. A. Aligia, K. Hallberg, B. Normand +1 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Charge (physics) #Condensed matter physics #Conductance #Degeneracy (biology) #Electron #Graphene research and applications #Ion #Ionic bonding #Molecular Junctions and Nanostructures #Phase transition #Physics #Quantum and electron transport phenomena #Quantum mechanics #Spin (aerodynamics) #Topological insulator #Topology (electrical circuits) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.93.076801
published as Phys. Rev. Lett. 93, 076801 (2004). · 4 pages, 5 figures, to appear in Phys. Rev. Lett
arxiv created 2004/06/16 · openalex publication_date 2004/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We analyze the phase transitions of an interacting electronic system weakly coupled to free-electron leads by considering its zero-bias conductance. This is expressed in terms of two effective impurity models for the cases with and without spin degeneracy. Using the half-filled ionic Hubbard ring, we demonstrate that the weight of the first conductance peak as a function of external flux or of the difference in gate voltages between even and odd sites allows one to identify the topological charge transition between a correlated insulator and a band insulator.