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Start Over Author "Ilan, Roni" Publisher american physical society (aps)
23 results on '"Ilan, Roni"'

5. Weyl orbits without an external magnetic field

Author

Peri, Valerio, Dubček, Tena, Valenti, Agnes, Ilan, Roni, and Huber, Sebastian D.

Subjects
Physics, Surface (mathematics), Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Semiclassical physics, 02 engineering and technology, Landau quantization, Gauge (firearms), 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic field, symbols.namesake, Classical mechanics, Ballistic conduction, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, symbols, 010306 general physics, 0210 nano-technology, Lorentz force, Sign (mathematics)
Abstract

Weyl semimetals in a magnetic field give rise to interesting non-local electronic orbits: the ballistic transport through the bulk enabled by the chiral Landau levels is combined with a momentum-space sliding along the surface Fermi-arc driven by the Lorentz force. Bulk chiral Landau levels can also be induced by axial fields whose sign depends on the chirality of the Weyl point. However, the microscopic perturbations that give rise to them can be described in terms of gauge fields only in the low-energy sectors around the Weyl points. In addition, since pseudo-fields are intrinsic, there is no apparent reason for a Lorentz force that causes sliding along the Fermi-arcs. Therefore, the existence of non-local orbits driven exclusively by pseudo-fields is not obvious. Here, we show that for systems with at least four Weyl points in the bulk spectrum, non-local orbits can be induced by axial fields alone. We discuss the underlying mechanisms by a combination of analytical semi-classical theory, the microscopic numerical study of wave-packet dynamics, and a surface Green's function analysis., 12 pages, 5 figures

Published
2020
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