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Articles by Valentin Leeb
Collinear $p$-Wave Magnetism and Hidden Orbital Ferrimagnetism
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Spontaneous Formation of Altermagnetism from Orbital Ordering
Abstract Altermagnetism has emerged as a third type of collinear magnetism. In contrast to standard ferromagnets and antiferromagnets, altermagnets exhibit extra even-parity wave spin order parameters resulting in a spin splitting of electronic bands in momentum space. In real space, sublattices of opposite spin polarization are anisotropic and related by rotational symmetry.
Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
Understanding the nematic phase observed in the iron-chalcogenide materials is crucial for describing their superconducting pairing. Experiments on FeSe1−xSx showed that one of the slow Shubnikov-de Haas quantum oscillation frequencies disappears when tuning the material out of the nematic phase via chemical substitution or pressure, which has been interpreted as a Lifshitz transition [Coldea et al., npj Quantum Mater. 4, 2 (2019); Reiss et al., Nat. Phys. 16, 89 (2020)].
Quantum oscillations in a doped Mott insulator beyond Onsager's relation
Abstract The kinetic energy of electrons in a magnetic field is quenched resulting in a discrete set of highly degenerate Landau levels (LLs) which gives rise to fascinating phenomena such as the de Haas–van Alphen effect (dHvAe) or the integer and fractional quantum Hall effects. The latter is a result of interactions partially lifting the degeneracy within a given LL while inter-LL interactions are usually assumed to be unimportant.
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