期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.127202
关键词
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资金
- European Research Council under the European Unions Horizon 2020 program/ERC [677458, 770887, 731473]
- Netherlands Organisation for Scientific Research (NWO/OCW) as part of the Frontiers of Nanoscience (NanoFront)
- Netherlands Organisation for Scientific Research (NWO/OCW) as part of the VIDI program
- European Unions Horizon 2020 research and innovation program [[823717]-ESTEEM3]
- University of Antwerp through the Concerted Research Actions (GOA) project Solarpaint
- Foundation for Polish Science through the International Research Agendas program - European Union within the Smart Growth Operational Programme
- Interdisciplinary Center of Modeling at the University of Warsaw [G73-23, G75-10]
- Narodowe Centrum Nauki (NCN, National Science Centre, Poland) [2019/34/E/ST3/00404]
- University of Antwerp through the TOP project
This study demonstrates how the topological and magnetic features of oxides can be manipulated by engineering charge discontinuities at oxide interfaces. Oxide heterostructures still face challenges in controlling the geometric structure of electronic wave functions, but this approach provides a new pathway for discovering unconventional properties.
In oxide heterostructures, different materials are integrated into a single artificial crystal, resulting in a breaking of inversion symmetry across the heterointerfaces. A notable example is the interface between polar and nonpolar materials, where valence discontinuities lead to otherwise inaccessible charge and spin states. This approach paved the way for the discovery of numerous unconventional properties absent in the bulk constituents. However, control of the geometric structure of the electronic wave functions in correlated oxides remains an open challenge. Here, we create heterostructures consisting of ultrathin SrRuO3, an itinerant ferromagnet hosting momentum-space sources of Berry curvature, and LaAlO3 , a polar wideband-gap insulator. Transmission electron microscopy reveals an atomically sharp LaO/RuO2/SrO interface configuration, leading to excess charge being pinned near the LaAlO3/SrRuO3 interface. We demonstrate through magneto-optical characterization, theoretical calculations and transport measurements that the real-space charge reconstruction drives a reorganization of the topological charges in the band structure, thereby modifying the momentum-space Berry curvature in SrRuO3 . Our results illustrate how the topological and magnetic features of oxides can be manipulated by engineering charge discontinuities at oxide interfaces.
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