Universal responses in nonmagnetic polar metals
We demonstrate that two phenomena, the kinetic magnetoelectric effect and the nonlinear Hall effect, are universal to polar metals as a consequence of their coexisting and contraindicated polarization and metallicity. We show that measurement of the effects provides a complete characterization of th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2024-03-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.013251 |
| _version_ | 1797210206412734464 |
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| author | Fabian Jäger Nicola A. Spaldin Sayantika Bhowal |
| author_facet | Fabian Jäger Nicola A. Spaldin Sayantika Bhowal |
| author_sort | Fabian Jäger |
| collection | DOAJ |
| description | We demonstrate that two phenomena, the kinetic magnetoelectric effect and the nonlinear Hall effect, are universal to polar metals as a consequence of their coexisting and contraindicated polarization and metallicity. We show that measurement of the effects provides a complete characterization of the nature of the polar metal, in that the nonzero response components indicate the direction of the polar axis, and the coefficients change signs on polarization reversal and become zero in the nonpolar phase. We illustrate our findings for the case of electron-doped PbTiO_{3} using a combination of density functional theory and model Hamiltonian-based calculations. Our model Hamiltonian analysis provides crucial insight into the microscopic origin of the effects, showing that they originate from inversion-symmetry-breaking-induced interorbital hoppings that correlate to an asymmetric charge density quantified by odd-parity charge multipoles. Our paper both heightens the relevance of the kinetic magnetoelectric and nonlinear Hall effects, and broadens the platform for investigating and detecting odd-parity charge multipoles in polar metals. |
| first_indexed | 2024-04-24T10:06:55Z |
| format | Article |
| id | doaj.art-0213e1e5c7cd4092b6cca43038ee4df9 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:06:55Z |
| publishDate | 2024-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-0213e1e5c7cd4092b6cca43038ee4df92024-04-12T17:40:09ZengAmerican Physical SocietyPhysical Review Research2643-15642024-03-016101325110.1103/PhysRevResearch.6.013251Universal responses in nonmagnetic polar metalsFabian JägerNicola A. SpaldinSayantika BhowalWe demonstrate that two phenomena, the kinetic magnetoelectric effect and the nonlinear Hall effect, are universal to polar metals as a consequence of their coexisting and contraindicated polarization and metallicity. We show that measurement of the effects provides a complete characterization of the nature of the polar metal, in that the nonzero response components indicate the direction of the polar axis, and the coefficients change signs on polarization reversal and become zero in the nonpolar phase. We illustrate our findings for the case of electron-doped PbTiO_{3} using a combination of density functional theory and model Hamiltonian-based calculations. Our model Hamiltonian analysis provides crucial insight into the microscopic origin of the effects, showing that they originate from inversion-symmetry-breaking-induced interorbital hoppings that correlate to an asymmetric charge density quantified by odd-parity charge multipoles. Our paper both heightens the relevance of the kinetic magnetoelectric and nonlinear Hall effects, and broadens the platform for investigating and detecting odd-parity charge multipoles in polar metals.http://doi.org/10.1103/PhysRevResearch.6.013251 |
| spellingShingle | Fabian Jäger Nicola A. Spaldin Sayantika Bhowal Universal responses in nonmagnetic polar metals Physical Review Research |
| title | Universal responses in nonmagnetic polar metals |
| title_full | Universal responses in nonmagnetic polar metals |
| title_fullStr | Universal responses in nonmagnetic polar metals |
| title_full_unstemmed | Universal responses in nonmagnetic polar metals |
| title_short | Universal responses in nonmagnetic polar metals |
| title_sort | universal responses in nonmagnetic polar metals |
| url | http://doi.org/10.1103/PhysRevResearch.6.013251 |
| work_keys_str_mv | AT fabianjager universalresponsesinnonmagneticpolarmetals AT nicolaaspaldin universalresponsesinnonmagneticpolarmetals AT sayantikabhowal universalresponsesinnonmagneticpolarmetals |