Nature research paper: Quantum oscillations of the quasiparticle lifetime in a metal
. Three mutually perpendicular nodal planes at the R point as depicted at the top of the panel enforce pairwise band degeneracies of the FS sheets labelled A, B and C, D. Numerically calculated MB with probabilities close to 1 occur between sheet pairs and along the lines as marked., Extremal cross-section for the three selected planes. In the plane, the cross-sections are doubly degenerate. In the and planes, four different cross-sections exist, with MB junctions denoted by coloured circles.
Three mutually perpendicular nodal planes at the R point are enclosed by regimes of hidden quasi-symmetry up to the enclosing surfaces , as depicted at the top of the panel. Within the green regimes, near degeneracies are approximated by exact degeneracies in first-order perturbation theory. The FS sheets of the perturbation Hamiltonian are labelled as orbital and spin degrees of freedom, for which sheet pairs and intersect at the surfaces of the quasi-symmetry..
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