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Strain engineering Dirac surface states in heteroepitaxial topological crystalline insulator thin films

Abstract

The unique crystalline protection of the surface states in topological crystalline insulators1 has led to a series of predictions of strain-generated phenomena, from the appearance of pseudo-magnetic fields and helical flat bands2 to the tunability of Dirac surface states by strain that may be used to construct ‘straintronic’ nanoswitches3. However, the practical realization of this exotic phenomenology via strain engineering is experimentally challenging and is yet to be achieved. Here, we have designed an experiment to not only generate and measure strain locally, but also to directly measure the resulting effects on Dirac surface states. We grew heteroepitaxial thin films of topological crystalline insulator SnTe in situ and measured them using high-resolution scanning tunnelling microscopy to determine picoscale changes in the atomic positions, which reveal regions of both tensile and compressive strain. Simultaneous Fourier-transform scanning tunnelling spectroscopy was then used to determine the effects of strain on the Dirac electrons. We find that strain continuously tunes the momentum space position of the Dirac points, consistent with theoretical predictions2,3. Our work demonstrates the fundamental mechanism necessary for using topological crystalline insulators in strain-based applications.

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Figure 1: SnTe heteroepitaxial thin films.
Figure 2: Quasiparticle interference (QPI) measurements.
Figure 3: Mapping the local lattice strain.
Figure 4: Strain engineering of the surface states band structure.

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Acknowledgements

V.M. acknowledges funding from the US Department of Energy, Scanned Probe Division (award no. DE-FG02-12ER46880), to support I.Z., K.L.S., B.A.A. and D.W. for this project. F.C. acknowledges support provided by MOST-Taiwan (project no. NSC-102-2119-M-002-004).

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I.Z., B.A.A. and V.M. conceived and designed the experiments. I.Z., D.W. and B.A.A. performed the experiments. I.Z., D.W. and K.L.S analysed the data. R.S. and F.C.C. contributed single-crystal substrates. I.Z. and V.M. co-wrote the paper. All authors discussed the results and commented on the manuscript.

Corresponding author

Correspondence to Vidya Madhavan.

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The authors declare no competing financial interests.

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Zeljkovic, I., Walkup, D., Assaf, B. et al. Strain engineering Dirac surface states in heteroepitaxial topological crystalline insulator thin films. Nature Nanotech 10, 849–853 (2015). https://doi.org/10.1038/nnano.2015.177

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