Bistability of zigzag edge magnetism in graphene nanoribbons induced by electric field
arXiv:2001.03264 · doi:10.1088/1361-6463/ac00ef
Abstract
In the presence of the Hubbard interaction, graphene zigzag nanoribbons have spontaneous edge magnetism with anti-parallel configuration, whose amplitude can be tuned by a transversal electric field. As the electric field increases or decreases across a critical value, the edges are demagnetized or re-magnetized, respectively. A magnetic field at each edge determines the orientation of the re-magnetization. Thus, a combination of slowly varying transversal electric field and magnetic field in monolayer graphene zigzag nanoribbon could drive the quantum system into a bistability loop. The same phenomenon can be induced in a bilayer/monolayer zigzag nanoribbon without the magnetic field, because the non-symmetry superexchange interaction controls the orientation of the re-magnetization. By this way, the quantum system is switched between ground state and quasi-stable excited state with different magnetism, band structures and conductance. This feature could be used to develop graphene-based spintronic nano-devices without magnetic field.
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References in corpus (16)
- Energy Gaps in Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Graphene Spintronics
- Emergence of magnetism in graphene materials and nanostructures
- Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
- Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
- Competition between spin and charge polarized states in nanographene ribbons with zigzag edges
- Dynamical Signatures of Edge-State Magnetism on Graphene Nanoribbons
- Hidden multiferroic order in graphene zigzag ribbons
- Interactions and magnetism in graphene boundary states
- Edge magnetization and local density of states in chiral nanoribbons
- Spin waves in zigzag graphene nanoribbons and the stability of edge ferromagnetism
- Non-local exchange effects in zigzag edge magnetism of neutral graphene nanoribbons
- Exact diagonalization study of the tunable edge magnetism in graphene
- Topological edge states of a graphene zigzag nanoribbon with spontaneous edge magnetism
- Bosonic field theory of tunable edge magnetism in graphene