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

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Wang, Xing; Liu, Xunshan; Aschauer, Ulrich Johannes; Decurtins, Silvio and Liu, Shi-Xia

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
000 Computer science, knowledge & systems

ISSN:

1936-0851

Publisher:

American Chemical Society

Language:

English

Submitter:

Pubmed Import

Date Deposited:

26 Sep 2022 10:50

Last Modified:

28 Oct 2022 00:15

Publisher DOI:

10.1021/acsnano.2c05333

PubMed ID:

36150702

Uncontrolled Keywords:

artificial atoms atomic force microscopy density functional theory energy dissipation quantum capacitance scanning tunneling microscopy supramolecular assembly

BORIS DOI:

10.48350/173221

URI:

https://boris.unibe.ch/id/eprint/173221

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