---
res:
  bibo_abstract:
  - We consider a class of two-dimensional tight binding models displaying conical
    intersections of the Bloch bands at the Fermi level. The setting includes the
    case of generic transitions between quantum Hall phases. We consider the longitudinal
    conductivity, as given by Kubo formula, describing the variation of the current
    after introducing a space-homogeneous electric field, in an adiabatic way. We
    obtain an explicit expression for the longitudinal conductivity, completely determined
    by the number of conical intersections and by the shape of the cones. In particular,
    the formula reproduces the known quantized values found for graphene and for the
    critical Haldane model. Furthermore, we discuss the validity of Kubo formula in
    presence of conical intersections in the spectrum, starting from the time-dependent
    Schrödinger equation. For electric fields which are weak and slowly varying in
    space and in time, we prove the validity of linear response from quantum dynamics.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Giovanna
      foaf_name: Marcelli, Giovanna
      foaf_surname: Marcelli
  - foaf_Person:
      foaf_givenName: Lorenzo
      foaf_name: Pigozzi, Lorenzo
      foaf_surname: Pigozzi
      foaf_workInfoHomepage: http://www.librecat.org/personId=efb8f850-3208-11ee-ac71-8c4f5803b9c6
  - foaf_Person:
      foaf_givenName: Marcello
      foaf_name: Porta, Marcello
      foaf_surname: Porta
  bibo_doi: 10.1007/s11005-026-02087-3
  bibo_issue: '4'
  bibo_volume: 116
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0377-9017
  - http://id.crossref.org/issn/1573-0530
  dct_language: eng
  dct_publisher: Springer Nature@
  dct_title: Longitudinal conductivity at integer quantum Hall transitions@
...