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Gauge-discontinuity contributions to Chern-Simons orbital magnetoelectric coupling
Jianpeng Liu, David Vanderbilt
We propose a new method for calculating the Chern-Simons orbital magnetoelectric coupling, conventionally parametrized in terms of a phase angle . According to previous theories…
Emergence of a Chern-insulating state from a semi-Dirac dispersion
Huaqing Huang, Zhirong Liu, Hongbin Zhang +2
A Chern insulator (quantum anomalous Hall insulator) phase is demonstrated to exist in a typical semi-Dirac system, the TiO2/VO2 heterostructure. By combining first-principles calc…
Chiral degeneracies and Fermi-surface Chern numbers in bcc Fe
Daniel Gosalbez-Martinez, Ivo Souza, David Vanderbilt
The degeneracies in the spinor bandstructure of bcc Fe are studied from first principles. We find numerous isolated band touchings carrying chiral charges of magnitude one (Weyl po…