Microscopic model for magnetoelectric coupling through lattice distortions
We propose a microscopic magnetoelectric model in which the coupling between spins and electric dipoles is mediated by lattice distortions. The magnetic sector is described by a spin S=1/2 Heisenberg model coupled directly to the lattice via a standard spin-Peierls term and indirectly to the electri...
| Autores principales: | , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2019
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124317 |
| Aporte de: |
| id |
I19-R120-10915-124317 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Física Magnetic field Physics Dipole Heisenberg model Electric dipole moment Condensed matter physics Density matrix renormalization group Magnetization Ising model Electric field |
| spellingShingle |
Física Magnetic field Physics Dipole Heisenberg model Electric dipole moment Condensed matter physics Density matrix renormalization group Magnetization Ising model Electric field Cabra, Daniel Carlos Dobry, Ariel Gazza, Claudio Rossini, Gerardo Luis Microscopic model for magnetoelectric coupling through lattice distortions |
| topic_facet |
Física Magnetic field Physics Dipole Heisenberg model Electric dipole moment Condensed matter physics Density matrix renormalization group Magnetization Ising model Electric field |
| description |
We propose a microscopic magnetoelectric model in which the coupling between spins and electric dipoles is mediated by lattice distortions. The magnetic sector is described by a spin S=1/2 Heisenberg model coupled directly to the lattice via a standard spin-Peierls term and indirectly to the electric dipole variables via the distortion of the surrounding electronic clouds. Electric dipoles are described by Ising variables for simplicity. We show that the effective magnetoelectric coupling which arises due to the interconnecting lattice deformations is quite efficient in one-dimensional arrays. More precisely, we show using bosonization and extensive density matrix renormalization group numerical simulations that increasing the magnetic field above the spin-Peierls gap, a massive polarization switch-off occurs due to the proliferation of soliton pairs. We also analyze the effect of an external electric field when the magnetic system is in a gapped (plateau) phase and show that the magnetization can be electrically switched between clearly distinct values. More general quasi-one-dimensional models and two-dimensional systems are also discussed. |
| format |
Articulo Preprint |
| author |
Cabra, Daniel Carlos Dobry, Ariel Gazza, Claudio Rossini, Gerardo Luis |
| author_facet |
Cabra, Daniel Carlos Dobry, Ariel Gazza, Claudio Rossini, Gerardo Luis |
| author_sort |
Cabra, Daniel Carlos |
| title |
Microscopic model for magnetoelectric coupling through lattice distortions |
| title_short |
Microscopic model for magnetoelectric coupling through lattice distortions |
| title_full |
Microscopic model for magnetoelectric coupling through lattice distortions |
| title_fullStr |
Microscopic model for magnetoelectric coupling through lattice distortions |
| title_full_unstemmed |
Microscopic model for magnetoelectric coupling through lattice distortions |
| title_sort |
microscopic model for magnetoelectric coupling through lattice distortions |
| publishDate |
2019 |
| url |
http://sedici.unlp.edu.ar/handle/10915/124317 |
| work_keys_str_mv |
AT cabradanielcarlos microscopicmodelformagnetoelectriccouplingthroughlatticedistortions AT dobryariel microscopicmodelformagnetoelectriccouplingthroughlatticedistortions AT gazzaclaudio microscopicmodelformagnetoelectriccouplingthroughlatticedistortions AT rossinigerardoluis microscopicmodelformagnetoelectriccouplingthroughlatticedistortions |
| bdutipo_str |
Repositorios |
| _version_ |
1764820450106408962 |