Energy Dissipation from Confined States in Nanoporous Molecular Networks.

D'Astolfo, Philipp; Wang, Xing; Liu, Xunshan; Kisiel, Marcin; Drechsel, Carl; Baratoff, Alexis; Aschauer, Ulrich; Decurtins, Silvio; Liu, Shi-Xia; Pawlak, Rémy; Meyer, Ernst (2022). Energy Dissipation from Confined States in Nanoporous Molecular Networks. ACS nano, 16(10), pp. 16314-16321. American Chemical Society 10.1021/acsnano.2c05333

Text acsnano.2c05333.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (5MB)

Crystalline nanoporous molecular networks are assembled on the Ag(111) surface, where the pores confine electrons originating from the surface state of the metal. Depending on the pore sizes and their coupling, an antibonding level is shifted upward by 0.1-0.3 eV as measured by scanning tunneling microscopy. On molecular sites, a downshifted bonding state is observed, which is occupied under equilibrium conditions. Low-temperature force spectroscopy reveals energy dissipation peaks and jumps of frequency shifts at bias voltages, which are related to the confined states. The dissipation maps show delocalization on the supramolecular assembly and a weak distance dependence of the dissipation peaks. These observations indicate that two-dimensional arrays of coupled quantum dots are formed, which are quantitatively characterized by their quantum capacitances and resonant tunneling rates. Our work provides a method for studying the capacitive and dissipative response of quantum materials with nanomechanical oscillators.

Interest & Impact

Downloads

1 since deposited on 26 Sep 2022
0 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item