Artificial relativistic molecules

Jae Whan Park, Hyo Sung Kim, Thomas Brumme, Thomas Heine and Han Woong Yeom ()
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Jae Whan Park: Institute for Basic Science (IBS)
Hyo Sung Kim: Institute for Basic Science (IBS)
Thomas Brumme: University of Leipzig
Thomas Heine: University of Leipzig
Han Woong Yeom: Institute for Basic Science (IBS)

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract We fabricate artificial molecules composed of heavy atom lead on a van der Waals crystal. Pb atoms templated on a honeycomb charge-order superstructure of IrTe2 form clusters ranging from dimers to heptamers including benzene-shaped ring hexamers. Tunneling spectroscopy and electronic structure calculations reveal the formation of unusual relativistic molecular orbitals within the clusters. The spin–orbit coupling is essential both in forming such Dirac electronic states and stabilizing the artificial molecules by reducing the adatom–substrate interaction. Lead atoms are found to be ideally suited for a maximized relativistic effect. This work initiates the use of novel two-dimensional orderings to guide the fabrication of artificial molecules of unprecedented properties.

Date: 2020
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DOI: 10.1038/s41467-020-14635-z

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