Geometrical effects in orbital magnetic susceptibility

Article

关键词: BLOCH ELECTRONS;    TOPOLOGICAL INSULATORS;    FIELD;   

DOI  :  10.1103/PhysRevB.91.214405

来源: SCIE

【 摘 要 】

Within the wave-packet semiclassical approach, the Bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of orbital magnetic susceptibility. The Berry curvature and quantum metric of the Bloch states give rise to a geometrical magnetic susceptibility, which can be dominant when bands are filled up to a small energy gap. There is also an energy polarization term, which can compete with the Peierls-Landau and Pauli magnetism on a Fermi surface. All these, and an additional Langevin susceptibility, can be calculated from each single band, leaving the Van Vleck susceptibility as the only term truly from interband coupling.

【 授权许可】

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