Issue 48, 2019

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

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

Supplementary files

Article information

Article type
Communication
Submitted
26 Aug 2019
Accepted
08 Nov 2019
First published
11 Nov 2019
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2019,11, 23132-23138

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, 11, 23132 DOI: 10.1039/C9NR07365E

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