Abstract
The magnetoresistance of conductors usually has a quadratic dependence on magnetic field1, however, examples exist of non-saturating linear behaviour in diverse materials2,3,4,5,6. Assigning a specific microscopic mechanism to this unusual phenomenon is obscured by the co-occurrence and interplay of doping, mobility fluctuations and a polycrystalline structure7,8. Bilayer graphene has virtually no doping fluctuations, yet provides a built-in mosaic tiling due to the dense network of partial dislocations9,10. We present magnetotransport measurements of epitaxial bilayer graphene that exhibits a strong and reproducible linear magnetoresistance that persists to B = 62 T at and above room temperature, decorated by quantum interference effects at low temperatures. Partial dislocations thus have a profound impact on the transport properties in bilayer graphene, a system that is frequently assumed to be dislocation-free. It further provides a clear and tractable model system for studying the unusual properties of mosaic conductors.
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Acknowledgements
We thank O. Pankratov for helpful discussions and D. Weckbecker for computational assistance. The work was carried out in the framework of the SFB953, the PP1459 and the Cluster of Excellence EXC 315 ‘Engineering of Advanced Materials’, supported by the DFG. We acknowledge the support of the HLD at HZDR, a member of the European Magnetic Field Laboratory (EMFL).
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F.K. and H.B.W. conceived the experiment. F.K. and C.O. carried out sample preparation, electrical measurement and data analysis, supported by C.H. in an early stage. F.K. and E.K. carried out high magnetic field measurements. B.B. and E.S. contributed structural information on dislocation networks by TEM. The quantum mechanical calculations were developed and performed by S.S. Network simulation was performed by F.K. and C.O. The manuscript was written by F.K., C.O., S.S. and H.B.W. All authors discussed the results and implications and commented on the manuscript at all stages.
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Kisslinger, F., Ott, C., Heide, C. et al. Linear magnetoresistance in mosaic-like bilayer graphene. Nature Phys 11, 650–653 (2015). https://doi.org/10.1038/nphys3368
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DOI: https://doi.org/10.1038/nphys3368
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