The quantum metric of electrons with spin-momentum locking
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arXiv
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
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| _version_ | 1866912552287469568 |
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| author | Sala, Giacomo Mercaldo, Maria Teresa Domi, Klevis Gariglio, Stefano Cuoco, Mario Ortix, Carmine Caviglia, Andrea D. |
| author_facet | Sala, Giacomo Mercaldo, Maria Teresa Domi, Klevis Gariglio, Stefano Cuoco, Mario Ortix, Carmine Caviglia, Andrea D. |
| contents | Quantum materials are characterized by electromagnetic responses intrinsically linked to the geometry and topology of electronic wavefunctions, encoded in the quantum metric and Berry curvature. Whereas Berry curvature-mediated transport effects have been identified in several magnetic and nonmagnetic systems, quantum metric-induced transport phenomena remain limited to topological antiferromagnets. Here we show that spin-momentum locking -- a general characteristic of the electronic states at surfaces and interfaces of spin-orbit coupled materials -- leads to a finite quantum metric. This metric activates a nonlinear in-plane magnetoresistance that we measure and electrically control in 111-oriented LaAlO$_3$/SrTiO$_3$ interfaces. These findings demonstrate the existence of quantum metric effects in a vast class of materials and enable previously unexplored strategies to design functionalities based on quantum geometry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06659 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The quantum metric of electrons with spin-momentum locking Sala, Giacomo Mercaldo, Maria Teresa Domi, Klevis Gariglio, Stefano Cuoco, Mario Ortix, Carmine Caviglia, Andrea D. Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons Quantum materials are characterized by electromagnetic responses intrinsically linked to the geometry and topology of electronic wavefunctions, encoded in the quantum metric and Berry curvature. Whereas Berry curvature-mediated transport effects have been identified in several magnetic and nonmagnetic systems, quantum metric-induced transport phenomena remain limited to topological antiferromagnets. Here we show that spin-momentum locking -- a general characteristic of the electronic states at surfaces and interfaces of spin-orbit coupled materials -- leads to a finite quantum metric. This metric activates a nonlinear in-plane magnetoresistance that we measure and electrically control in 111-oriented LaAlO$_3$/SrTiO$_3$ interfaces. These findings demonstrate the existence of quantum metric effects in a vast class of materials and enable previously unexplored strategies to design functionalities based on quantum geometry. |
| title | The quantum metric of electrons with spin-momentum locking |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2407.06659 |