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Direction-dependent conductivity in planar Hall set-ups with tilted Weyl/multi-Weyl semimetals
Rahul Ghosh1, Ipsita Mandal1,2
1Department of Physics, Shiv Nadar Institution of Eminence (SNIoE), Gautam Buddha Nagar, Uttar Pradesh 201314, India.
Summary
We calculated magnetoelectric conductivity in Weyl semimetals, finding unique topological effects. These effects, linear in magnetic field strength, dominate conductivity and alter response periodicity and sign.
Area of Science:
- Condensed Matter Physics
- Topological Materials Science
Background:
- Weyl semimetals (WSMs) and multi-Weyl semimetals (mWSMs) exhibit unique electronic properties due to their band structure topology.
- Magnetoelectric effects in materials are crucial for advanced electronic applications.
Purpose of the Study:
- To compute magnetoelectric conductivity tensors in tilted WSMs and mWSMs under various electromagnetic field orientations.
- To investigate the origin and characteristics of non-Drude contributions to conductivity.
Main Methods:
- Theoretical computation of magnetoelectric conductivity tensors.
- Analysis of responses in planar Hall configurations with tilted WSMs/mWSMs.
- Consideration of all relative orientations of electromagnetic fields and tilt direction.
Main Results:
- Discovered linear-in-|B| terms in conductivity arising from Berry curvature in tilted WSMs/mWSMs.
- These topological terms dominate realistic parameter regimes and are independent of |B|^2 terms.
- Observed changes in response periodicity (π to 2π) and sign depending on the angle between electric and magnetic fields.
Conclusions:
- The presence of a tilt is essential for observing linear-in-|B| magnetoelectric effects in specific configurations.
- These topological effects offer a distinct signature for identifying WSM/mWSM properties.
- The findings provide insights into the fundamental transport properties of topological semimetals.
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