| Autor: |
Guarochico-Moreira VH; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K.; Facultad de Ciencias Naturales y Matemáticas, Escuela Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo, Km. 30.5 Vía Perimetral, P.O. Box 09-01-5863, 090902 Guayaquil, Ecuador., Sambricio JL; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K., Omari K; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K., Anderson CR; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K., Bandurin DA; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K., Toscano-Figueroa JC; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K.; Consejo Nacional de Ciencia y Tecnología (CONACyT), Av. Insurgentes Sur 1582, Col. Crédito Constructor, Alcaldía Benito Juarez, C.P. 03940, Ciudad de México, México., Natera-Cordero N; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K.; Consejo Nacional de Ciencia y Tecnología (CONACyT), Av. Insurgentes Sur 1582, Col. Crédito Constructor, Alcaldía Benito Juarez, C.P. 03940, Ciudad de México, México., Watanabe K; National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan., Taniguchi T; National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan., Grigorieva IV; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K., Vera-Marun IJ; Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, U.K. |
| Abstrakt: |
Spintronics involves the development of low-dimensional electronic systems with potential use in quantum-based computation. In graphene, there has been significant progress in improving spin transport characteristics by encapsulation and reducing impurities, but the influence of standard two-dimensional (2D) tunnel contacts, via pinholes and doping of the graphene channel, remains difficult to eliminate. Here, we report the observation of spin injection and tunable spin signal in fully encapsulated graphene, enabled by van der Waals heterostructures with one-dimensional (1D) contacts. This architecture prevents significant doping from the contacts, enabling high-quality graphene channels, currently with mobilities up to 130 000 cm 2 V -1 s -1 and spin diffusion lengths approaching 20 μm. The nanoscale-wide 1D contacts allow spin injection both at room and at low temperature, with the latter exhibiting efficiency comparable with 2D tunnel contacts. At low temperature, the spin signals can be enhanced by as much as an order of magnitude by electrostatic gating, adding new functionality. |
