When hearing “pi-phase” and “quantum oscillations”, would you immediately jump to Berry phase? In a recent collaborative work, we have shown that a new kind of “pi-phase shift”, i.e., that between quantum oscillations in longitudinal resistivities along orthogonal directions, in the prototypical spin density wave material Cr, is caused by quantum interference effects between coupled semiclassical orbits. For an in-depth introduction, see this note which was a presentation given at the “Magneticians’ meeting” at Johns Hopkins University in 2023.
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