Abstract
Atom assemblies on surfaces represent the ultimate lower size limit for electronic circuits, and their conduction properties are governed by quantum phenomena. A fundamental prediction for a line of atoms confining the electrons to one dimension is the Tomonaga–Luttinger liquid1. Yet, astonishingly, this has not been observed in surface systems so far. Here we scrutinize self-organized chains of single-atom width by scanning tunnelling spectroscopy and photoemission. The low-energy spectra univocally show power-law behaviour. Even more, the density of states obeys universal scaling with energy and temperature. This demonstrates paradigmatic Tomonaga–Luttinger liquid properties2,3 encountered at the atomic scale, with bearing for the conductivity of wires and junctions. Local control enables us to study modified interactions due to defects or bridging atoms not previously possible.
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Acknowledgements
We thank S. Eggert, V. Meden, B. Trauzettel, P. Recher and F. F. Assaad for theoretical discussions. We also acknowledge support by the Deutsche Forschungsgemeinschaft under grants Scha 1510/2 and FOR 1162.
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C.B., J.S., S. Mietke, S. Meyer, A.D. and M.L. carried out the experiments, R.M. provided STS expertise, X.Y.C. and L.P. ran the photoemission station, C.B., J.S., S. Mietke, S. Meyer and A.D. analysed the data, C.B., J.S. and S. Meyer made the figures, J.S. and R.C. wrote the text and all authors contributed to critical discussion of the data.
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Blumenstein, C., Schäfer, J., Mietke, S. et al. Atomically controlled quantum chains hosting a Tomonaga–Luttinger liquid. Nature Phys 7, 776–780 (2011). https://doi.org/10.1038/nphys2051
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DOI: https://doi.org/10.1038/nphys2051
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