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Surface state tunable energy and mass renormalization from homothetic quantum dot arrays

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Abstract

Quantum dot arrays in the form of molecular nanoporous networks are renowned for modifying the electronic surface properties through quantum confinement. Here we show that, compared to the pristine surface state, the band bottom of the confined states can exhibit downward shifts accompanied by a lowering of the effective masses simultaneous to the appearance of tiny gaps at the Brillouin zone boundaries. We observed these effects by angle resolved photoemission for two self-assembled homothetic (scalable) Co-coordinated metal–organic networks. Complementary scanning tunneling spectroscopy measurements confirmed these findings. Electron plane wave expansion simulations and density functional theory calculations provide insight into the nature of this phenomenon, which we assign to metal–organic overlayer–substrate interactions in the form of adatom–substrate hybridization. To date, the absence of the experimental band structure resulting from single metal adatom coordinated nanoporous networks has precluded the observation of the significant surface state renormalization reported here, which we infer to be general for low interacting and well-defined adatom arrays.

Graphical abstract: Surface state tunable energy and mass renormalization from homothetic quantum dot arrays

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Publication details

The article was received on 26 Aug 2019, accepted on 08 Nov 2019 and first published on 11 Nov 2019


Article type: Communication
DOI: 10.1039/C9NR07365E
Nanoscale, 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Surface state tunable energy and mass renormalization from homothetic quantum dot arrays

    I. Piquero-Zulaica, J. Li, Z. M. Abd El-Fattah, L. Solianyk, I. Gallardo, L. Monjas, A. K. H. Hirsch, A. Arnau, J. E. Ortega, M. Stöhr and J. Lobo-Checa, Nanoscale, 2019, Advance Article , DOI: 10.1039/C9NR07365E

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