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Tailoring sample-wide pseudo-magnetic fields on a graphene–black phosphorus heterostructure

Abstract

Spatially tailored pseudo-magnetic fields (PMFs) can give rise to pseudo-Landau levels and the valley Hall effect in graphene. At an experimental level, it is highly challenging to create the specific strain texture that can generate PMFs over large areas. Here, we report that superposing graphene on multilayer black phosphorus creates shear-strained superlattices that generate a PMF over an entire graphene–black phosphorus heterostructure with edge size of tens of micrometres. The PMF is intertwined with the spatial period of the moiré pattern, and its spatial distribution and intensity can be modified by changing the relative orientation of the two materials. We show that the emerging pseudo-Landau levels influence the transport properties of graphene–black phosphorus field-effect transistor devices with Hall bar geometry. The application of an external magnetic field allows us to enhance or reduce the effective field depending on the valley polarization with the prospect of developing a valley filter.

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Fig. 1: Schematic of G–BP device.
Fig. 2: Angle-dependent moiré superlattices.
Fig. 3: Spatial pseudo-magnetic field texture and θ-dependent strain.
Fig. 4: Structural and electronic properties of G–BP heterostructure.
Fig. 5: Angle-dependence of STS spectra and pseudo-magnetic fields.
Fig. 6: Transport data of a G–BP (thickness ~8 nm) device with Hall bar geometry.

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Acknowledgements

The authors thank L. Xin and Q. Su Ying for valuable suggestions. K.P.L. and S.A. acknowledge support from the Singapore Ministry of Education AcRF Tier 2 (MOE2017-T2-2-140).

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Contributions

K.P.L. supervised the project. Y.L., K.P.L. and J.L. designed and performed the experiments. J.N.B.R., Y.Z.L. and E.L. performed calculations under the supervision of S.A. and Y.P.F. Y.L. and L.L. fabricated and measured the G–BP FET device. A.C. and M.Y. carried out DFT calculations under the supervision of A.H.C.N. and Y.P.F. J.L. helped to collect and analyse angle-resolved Raman experimental data under the supervision of C.H.S. H.X. Y.B. and Z.Q. helped to collect and analyse STM data. S.J.R.T. provided support for XPS and ARPES experiments. Y.L. and K.P.L. co-wrote the manuscript. All authors discussed the results and commented on the manuscript.

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Correspondence to Shaffique Adam or Jiong Lu or Kian Ping Loh.

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Liu, Y., Rodrigues, J.N.B., Luo, Y.Z. et al. Tailoring sample-wide pseudo-magnetic fields on a graphene–black phosphorus heterostructure. Nature Nanotech 13, 828–834 (2018). https://doi.org/10.1038/s41565-018-0178-z

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