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Axial Magnetoelectric Effect in Dirac Semimetals
Long Liang1, P O Sukhachov2, A V Balatsky1,3
1Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden.
Physical Review Letters
|July 2, 2021
Summary
We introduce the axial magnetoelectric effect (AMEE) to generate static magnetization in Dirac and Weyl semimetals. This novel effect, driven by axial electric fields, offers unique properties compared to the inverse Faraday effect.
Area of Science:
- Condensed matter physics
- Materials science
- Electromagnetism
Background:
- The inverse Faraday effect enables optical control of magnetism.
- Exploring novel magnetoelectric effects is crucial for advanced materials.
Purpose of the Study:
- To propose and theoretically investigate the axial magnetoelectric effect (AMEE) for generating static magnetization.
- To analyze the mechanism of angular momentum transfer from axial electric fields to magnetic moments.
Main Methods:
- Theoretical modeling of magnetization generation via AMEE in Dirac and Weyl semimetals.
- Comparison of AMEE with the conventional inverse Faraday effect.
- Estimation of AMEE magnitude generated by circularly polarized acoustic waves.
Main Results:
- Magnetization arises from the transfer of angular momentum from axial electric fields (E5) to magnetic moments.
- AMEE exhibits distinct behaviors from the inverse Faraday effect, including linear frequency dependence at low frequencies.
- Calculated AMEE magnitudes reach microgauss levels for gigahertz acoustic waves.
Conclusions:
- The proposed AMEE offers a new pathway for static magnetization generation in specific materials.
- AMEE provides a method to study unusual axial electromagnetic fields using standard magnetometry.
- This effect has potential applications in spintronics and novel magnetic device development.
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