Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr
arxiv(2024)
摘要
In the field of 2D magnetic semiconductors, CrSBr has been the focus of
research due to its intriguing magnetic, transport and optical properties that
have potential to underpin novel devices. Here we present the evolution of the
electronic structure of CrSBr from its antiferromagnetic ground state to the
paramagnetic phase. The ground state photoemission data, obtained using a novel
method to overcome sample charging issues, is very well reproduced by
𝐐𝐒𝐆Ŵ calculations, a self-consistent many-body perturbative
approach that computes electronic eigenfunctions in presence of excitonic
correlations. The electronic structure is complex at Γ, but
simplifies at the X points of the Brillouin zone where the non-symmorphic
lattice symmetry enforces band degeneracies. In the vicinity of these X points,
in the deeper-lying valence bands one can identify pairs of states with mainly
Br- and S- character. The energy splitting between them is understood as an
exchange splitting within the individual layers in which the spins all align,
despite the absence of a net magnetic moment in the so-called A-type
antiferromagnetic arrangement. By tracing band positions as a function of
temperature, we identify that this exchange splitting disappears above T_N,
alongside a significant increase in the spectral broadening in all states.
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