Electrically driven singlet-triplet transition in triangulene spin-1 chains

Abstract

Recently, graphene triangulene chains have been synthesized and their magnetic response has been analyzed by STM methods by Mishra and coworkers (Nature 598, 287 (2021)). Motivated by this study, we determine the exchange bilinear and biquadratic constants of the triangulene chains by calculating two-spin rotations in the spirit of the magnetic force theorem. We then analyze open-ended, odd-numbered chains, whose edge states pair up forming a triplet ground state. We propose three experimental approaches that enable us to trigger and control a singlet-triplet spin transition. Two of these methods are based on applying a mechanical distortion to the chain. We finally show that the transition can be controlled efficiently by the application of an electric field.

References in corpus (6)

• Magnetism in graphene nano-islands
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Observation of fractional edge excitations in nanographene spin chains
• Aza-Triangulene: On-Surface Synthesis, Electronic and Magnetic Properties
• Realising the Symmetry-Protected Haldane Phase in Fermi-Hubbard Ladders
• Probing the magnetism of topological end-states in 5-armchair graphene nanoribbons

Cited by in corpus (9)

• Stacking-engineered ferroelectricity and multiferroic order in van der Waals magnets
• Superexchange Mechanism in Coupled Triangulenes Forming Spin-1 Chains
• Relativistic magnetic interactions from non-orthogonal basis sets
• Tuning magnetic exchange interactions in 2D magnets: the case of CrGeX${}_3$ (X = Se, Te) and Janus Cr${}_2$Ge${}_2$(Se,Te)${}_3$ monolayers
• Persistent Haldane Phase in Carbon Tetris Chains
• Spin Wave Dispersion of the van der Waals Antiferromagnet NiPS${}_3$
• Reference lattice, sound, stiffness, and magnetic transitions of Ising monolayers
• Two topological phases in exchange alternating spin-1 nanographene chains
• Graphene-based quantum heterospin graphs