Journal
PHYSICAL REVIEW MATERIALS
Volume 6, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.6.124404
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Funding
- Vannevar Bush Faculty Fellowship (VBFF) [W911NF-21-2-0162]
- Department of Defense
- ARO [ANR-21-CE24-0032]
- ANR [ANR-10-LABX-0035]
- ANR as part of the Investissements dAvenir program [N00014-21-1-2086]
- ONR
- National Natural Science Foundation of China
- Soochow University
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- [N00014-20-1-2834]
- [W911NF-21-1-0113]
- Agence Nationale de la Recherche (ANR) [ANR-21-CE24-0032] Funding Source: Agence Nationale de la Recherche (ANR)
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This study reveals that the frequency of electromagnons can be controlled by applying electric fields, and this control is correlated with the local characteristics of polar phonons.
Electromagnons, which are coupled polar and magnetic excitations in magnetoelectric materials, are of large interest for electronic and computing technological devices. Using molecular dynamics simulations based on an ab initio effective Hamiltonian, we predict that the frequency of several electromagnons can be tuned by the application of electric fields in the model multiferroic BiFeO3, with this frequency either increasing or decreasing depending on the selected electromagnon. In particular, we show that the frequency of electromagnons localized at ferroelectric domain walls can be tuned over a 200 GHz range by realistic dc electric fields. We interpret the realized frequency increase (decrease) by local hardening (softening) of the associated polar phonons which couples to the applied electric field. The increase versus decrease in the electromagnon frequency is further found to be correlated with the real-space localization of such phonons.
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