Magnetic Correlations in Short and Narrow Graphene Armchair Nanoribbons

Abstract

Electronic states at the ends of a narrow armchair nanoribbon give rise to a pair of non-locally entangled spins. We propose two experiments to probe these magnetic states, based on magnetometry and tunneling spectroscopy, in which correlation effects lead to a striking, nonlinear response to external magnetic fields. On the basis of low-energy theories that we derive here, it is remarkably simple to assess these nonlinear signatures for magnetic edge states. The effective theories are especially suitable in parameter regimes where other methods such as quantum Monte-Carlo simulations are exceedingly difficult due to exponentially small energy scales. The armchair ribbon setup discussed here provides a promisingly well-controlled (both experimentally and theoretically) environment for studying the principles behind edge magnetism in graphene-based nano-structures.

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Cited by in corpus (12)

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• Giant magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery
• Quantum Nature of Edge Magnetism in Graphene
• Graphene nanoflakes in external electric and magnetic in-plane fields
• Edge magnetization and local density of states in chiral nanoribbons
• Correlated Topological States in Graphene Nanoribbon Heterostructures
• Probing local moments in nanographenes with electron tunneling spectroscopy
• Ultra long spin decoherence times in graphene quantum dots with a small number of nuclear spins
• Quantum phase transitions in effective spin-ladder models for graphene zigzag nanoribbons
• Effect of long-range interaction on graphene edge magnetism
• Room-Temperature Pauli Spin Blockade and Current Rectification in 15-13-15 Armchair Graphene Nanoribbon Heterostructures
• Electron enrichment of zigzag edges of armchair-oriented graphene nano-ribbons increases their stability and induces pinning of Fermi level