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arXiv · 1603.00745

Electronic structure of atomic manganese chains supported on Cu$_2$N / Cu (100)

Deung-Jang Choi·Roberto Robles·Jean-Pierre Gauyacq·Carmen Rubio Verdú·Nicolás Lorente·José Ignacio Pascual
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Abstract

Scanning tunnelling microscopy and density functional theory studies of manganese chains adsorbed on Cu$_2$N/Cu (100) reveal an unsuspected electronic edge state at $\sim 1$ eV above the Fermi energy. This Tamm-like state is strongly localised to the last Mn atom of the chain and fully spin polarised. However, no equivalence is found for occupied states, and the electronic structure at $\sim -1$ eV is mainly spin unpolarised due to the extended $p$-states of the N atoms that mediate the coupling between the Mn atoms in the chain. Odd-numbered Mn chains present an exponentially decreasing direct coupling with distance between the two edges, leading to a vanishing bonding/anti-bonding splitting of states while even-numbered Mn chains present perfect decoupling of both edges due to the the antiferromagnetic ordering of Mn chains.

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Deung-Jang Choi, Roberto Robles, Jean-Pierre Gauyacq, Carmen Rubio Verdú, Nicolás Lorente, José Ignacio Pascual. 2016-03-02. Electronic structure of atomic manganese chains supported on Cu$_2$N / Cu (100). https://doi.org/10.1088/0953-8984/28/23/23lt01

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