Tunable Magnetic Coupling in Graphene Nanoribbon Quantum Dots

Jacobse, Peter H.; Sarker, Mamun; Saxena, Anshul; Zahl, Percy; Wang, Ziyi; Berger, Emma; Aluru, Narayana R.; Sinitskii, Alexander; Crommie, Michael F.

doi:10.1002/smll.202400473

Title: Tunable Magnetic Coupling in Graphene Nanoribbon Quantum Dots

Journal Article · 26 February 2024 · Small

DOI: https://doi.org/10.1002/smll.202400473 · OSTI ID:2315059

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^[2]; Saxena, Anshul ^[3];

^[4]; Wang, Ziyi ^[5];

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Department of Physics University of California, Berkeley Berkeley CA 94720 USA
Department of Chemistry University of Nebraska Lincoln NE 68588 USA, Nebraska Center for Materials and Nanoscience University of Nebraska‐Lincoln Lincoln NE 68588 USA
Walker Department of Mechanical Engineering University of Texas Austin TX 78712 USA, Oden Institute for Computational Engineering and Sciences University of Texas at Austin Austin TX 78712 USA
Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
Department of Physics University of California, Berkeley Berkeley CA 94720 USA, Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Kavli Energy NanoSciences Institute at the University of California Berkeley and the Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Abstract Carbon‐based quantum dots (QDs) enable flexible manipulation of electronic behavior at the nanoscale, but controlling their magnetic properties requires atomically precise structural control. While magnetism is observed in organic molecules and graphene nanoribbons (GNRs), GNR precursors enabling bottom‐up fabrication of QDs with various spin ground states have not yet been reported. Here the development of a new GNR precursor that results in magnetic QD structures embedded in semiconducting GNRs is reported. Inserting one such molecule into the GNR backbone and graphitizing it results in a QD region hosting one unpaired electron. QDs composed of two precursor molecules exhibit nonmagnetic, antiferromagnetic, or antiferromagnetic ground states, depending on the structural details that determine the coupling behavior of the spins originating from each molecule. The synthesis of these QDs and the emergence of localized states are demonstrated through high‐resolution atomic force microscopy (HR‐AFM), scanning tunneling microscopy (STM) imaging, and spectroscopy, and the relationship between QD atomic structure and magnetic properties is uncovered. GNR QDs provide a useful platform for controlling the spin‐degree of freedom in carbon‐based nanostructures.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; AC02-05CH11231; SC0012704

OSTI ID:: 2315059

Alternate ID(s):: OSTI ID: 2324872

Journal Information:: Small, Journal Name: Small; ISSN 1613-6810

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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