30 citations · 89 across the 11 of their papers we have counts for
5 papers · 1 filter
Thermodynamics and spin mapping of quantum excitations in a Heisenberg spin heptamer
A. Roxburgh, J. T. Haraldsen
In this study, we examine the thermodynamics and spin dynamics of spin-1/2 and spin-3/2 heptamers. Through an exact diagonalization of the isotropic Heisenberg Hamiltonian, we find…
Spin channel induced directional dependent spin exchange interactions between divacantly substituted Fe atoms in graphene
R. Putnam, A. V. Balatsky, J. T. Haraldsen
In this study, we investigate the isolated magnetic interactions between two identical Fe atoms divacantly-substituted into graphene. Using density functional theory, we simulated…
First principles investigation of nanopore sequencing using variable voltage bias on graphene-based nanoribbons
Hannah L. McFarland, Towfiq Ahmed, Jian-Xin Zhu +2
In this study, we examine the mechanism of nanopore-based DNA sequencing using a voltage bias across a graphene nanoribbon. Using density functional theory and a non-equilibrium Gr…
Spatial dependence of the superexchange interactions for transition-metal trimers in graphene
Charles B. Crook, Gregory Houchins, Jian-Xin Zhu +3
This study examines the magnetic interactions between spatially-variable manganese and chromium trimers substituted into a graphene superlattice. Using density functional theory, w…
Manifolds of magnetic ordered states and excitations in the almost Heisenberg pyrochlore antiferromagnet MgCr2O4
S. Gao, K. Guratinder, V. Tsurkan +18
In spinels ACr2O4 (A=Mg, Zn) realisation of the classical pyrochlore Heisenberg antiferromagnet model is complicated by a strong spin-lattice coupling: the extensive degeneracy of…