journal article·2021-12-28Open access

Rationally Designed Topological Quantum Dots in Bottom-Up Graphene Nanoribbons

Daniel J. Rizzo, Jingwei Jiang, Dharati Joshi, Gregory Veber, Christopher Bronner, Rebecca A. Durr, Peter H. Jacobse, Ting Cao, Alin Kalayjian, Henry Rodriguez, Paul Butler, Ting Chen, Steven G. Louie, Felix R. Fischer, Michael F. Crommie

ACS Nano· Volume 15· Issue 12

Abstract

Bottom-up graphene nanoribbons (GNRs) have recently been shown to host nontrivial topological phases. Here, we report the fabrication and characterization of deterministic GNR quantum dots whose orbital character is defined by zero-mode states arising from nontrivial topological interfaces. Topological control was achieved through the synthesis and on-surface assembly of three distinct molecular precursors designed to exhibit structurally derived topological electronic states. Using a combination of low-temperature scanning tunneling microscopy and spectroscopy, we have characterized two GNR topological quantum dot arrangements synthesized under ultrahigh vacuum conditions. Our results are supported by density-functional theory and tight-binding calculations, revealing that the magnitude and sign of orbital hopping between topological zero-mode states can be tuned based on the bonding geometry of the interconnecting region. These results demonstrate the utility of topological zero modes as components for designer quantum dots and advanced electronic devices.
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Research context

OpenAlex topics: Graphene research and applications · Topological Materials and Phenomena · Surface Chemistry and Catalysis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, University of California, Berkeley, California 94720, United States

Department of Physics, Columbia University, New York, New York 10027, United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Department of Chemistry, University of California, Berkeley, California 94720, United States

Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States

Kavli Energy NanoSciences Institute at the University of California Berkeley and the Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Funding

Basic Energy Sciences · Office of Naval Research · Division of Materials Research · Nederlandse Organisatie voor Wetenschappelijk Onderzoek · Frontera computing project at the Texas Advanced Computing Center

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