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54 papers
Covariant derivatives of Berry-type quantities: Application to nonlinear transport
Xiaoxiong Liu, Stepan S. Tsirkin, Ivo Souza
The derivatives of the Berry curvature and intrinsic orbital magnetic moment m in momentum space are relevant to various problems, including the nonlinear anomalous Hall effect…
Electrical magnetochiral anisotropy in trigonal tellurium from first principles
Xiaoxiong Liu, Ivo Souza, Stepan S. Tsirkin
Structural chirality gives rise to characteristic responses that change sign with the handedness of the crystal structure. One example is electrical magnetochiral anisotropy (eMChA…
Ab initio study of the nonlinear optical properties and d.c. photocurrent of the Weyl semimetal TaIrTe
Álvaro R. Puente-Uriona, Stepan S. Tsirkin, Ivo Souza +1
We present a first principles theoretical study employing nonlinear response theory to investigate the d.c. photocurrent generated by linearly polarized light in the type-II Weyl s…
Multipole theory of optical spatial dispersion in crystals
Óscar Pozo, Ivo Souza
Natural optical activity is the paradigmatic example of an effect originating in the weak spatial inhomogeneity of the electromagnetic field on the atomic scale. In molecules, such…
On the separation of Hall and Ohmic nonlinear responses
Stepan S. Tsirkin, Ivo Souza
The symmetric and antisymmetric parts of the linear conductivity describe the dissipative (Ohmic) and nondissipative (Hall) parts of the current. The Hall current is always transve…
Mirror Chern numbers in the hybrid Wannier representation
Tomáš Rauch, Thomas Olsen, David Vanderbilt +1
The topology of electronic states in band insulators with mirror symmetry can be classified in two different ways. One is in terms of the mirror Chern number, an integer that count…