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Field-Selective Anomaly and Chiral Mode Reversal in Type-II Weyl Materials
M Udagawa1, E J Bergholtz2,3
1Department of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171-8588, Japan.
Physical Review Letters
|September 3, 2016
Summary
Type-II Weyl fermions in materials like MoTe2 exhibit unique properties under magnetic fields. Their tilted dispersion influences the chiral anomaly, offering a new magneto-optical resonance for detecting Weyl nodes.
Area of Science:
- Condensed Matter Physics
- High-Energy Physics
- Materials Science
Background:
- Three-dimensional Weyl fermions typically have tilted dispersion, unlike their high-energy counterparts constrained by Lorentz invariance.
- Type-II Weyl fermions, found in materials like MoTe2, LaAlGe, and WTe2, possess strongly tilted dispersion, forming Fermi surfaces and connecting electron-hole pockets at Weyl nodes.
- Graphene's low-energy excitations lack dispersion tilt due to symmetry constraints.
Purpose of the Study:
- To predict the unique properties of type-II Weyl fermion systems in the presence of magnetic fields.
- To investigate the influence of magnetic fields on the chiral anomaly in these materials.
- To explore the potential for novel magneto-optical phenomena and experimental detection methods.
Main Methods:
- Theoretical prediction of physical properties.
- Analysis of chiral anomaly dependence on magnetic field orientation and tilt.
- Investigation of inversion-asymmetric overtilting effects.
Main Results:
- The chiral anomaly's nature is critically dependent on the angle between the magnetic field and the fermion dispersion tilt.
- Inversion-asymmetric overtilting leads to an imbalance in chiral modes with positive and negative slopes.
- A field-selective chiral anomaly is predicted, manifesting as a novel magneto-optical resonance.
Conclusions:
- Type-II Weyl fermion systems exhibit distinct behaviors in magnetic fields due to their tilted dispersion.
- The interplay between magnetic fields and tilt offers a tunable platform for studying topological phenomena.
- A novel magneto-optical resonance provides an experimental pathway for identifying concealed Weyl nodes in materials.
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