65 citations · 682 across the 37 of their papers we have counts for
38 papers
Strain-controlled topology and quantum control at a cubic Ce crystal-field crossing
A. Ghosh, J. T. Haraldsen
Field-tuned crystal-field crossings provide a route to synthetic topology in localized rare-earth degrees of freedom when symmetry-resolved perturbations can independently control…
General structure factor and dynamic effects of the Dzyaloshinskii-Moriya interaction in S = 1/2 clusters
Evan M. Wilson, Joseph A. Prescott, Jason T. Haraldsen
Understanding the effects of the Dzyaloshinskii-Moriya interaction (DMI) has become increasingly important in the context of nanoscale magnetism and spintronics. In this study, we…
Exact eigenvalues and experimental signatures of Heisenberg-Kitaev interactions in spin-1/2 quantum clusters
Evan M. Wilson, Jian-Xin Zhu, Jason T. Haraldsen
We investigate the thermodynamics and energy eigenstates of a spin-1/2 coupled trimer, tetramer in a star configuration, and tetrahedron. Using a Heisenberg Hamiltonian with additi…
Understanding the magnetic interactions of the zig-zag honeycomb lattice: Application to -RuCl
E. M. Wilson, J. T. Haraldsen
This investigation covers the effects of variable exchange interactions on the spin dynamics of the zig-zag honeycomb lattice. Using a Holstein-Primakoff expansion of the Heisenber…
Parameter free treatment of a layered correlated van der Waals magnet: CrPS
A. R. Alcantara, C. Lane, J. T. Haraldsen +1
The electronic and magnetic structure of CrPS, a 2D magnetic semiconductor is examined by employing the SCAN meta-GGA density functional. We find the resulting magnetic momen…
Understanding the onset of negative electronic compressibility in one- and two-band 2D electron gases: Application to LaAlO/SrTiO
A. D. Mahabir, A. V. Balatsky, J. T. Haraldsen
We investigate the effects of two electronic bands at the negative electronic compressibility (NEC) in a two-dimensional electron gas (2DEG). We use a simple homogeneous model with…
Effects of exchange distortions in the magnetic Kagome lattice
A. A. Coker, A. Saxena, J. T. Haraldsen
This study examines the effect of distorted triangular magnetic interactions in the Kagome lattice. Using a Holstein-Primakoff expansion, we determine the analytical solutions for…
Designing a path towards superconductivity through magnetic exchange in transition-metal intercalated bilayer graphene
Kevin P. Lucht, A. D. Mahabir, A. Alcantara +3
This study examines the potential of superconductivity in transition metal (TM) intercalated bilayer graphene through a systematic study of the electronic and magnetic properties.…
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…
Evolution of magnetic Dirac bosons in a honeycomb lattice
D. Boyko, J. T. Haraldsen, A. V. Balatsky
We examine the presence and evolution of magnetic Dirac nodes in the Heisenberg honeycomb lattice. Using linear spin theory, we evaluate the collinear phase diagram as well as the…
Evolution of the thermodynamic properties and inelastic neutron scattering intensities for spin-1/2 antiferromagnetic quantum rings
J. T. Haraldsen
This study examines the increasing complexity in the magnetic properties of small = 3, 4, 5, 6 spin-1/2 quantum rings. Using an exact diagonalization of the isotropic Heisenber…
Voltage-dependent spin flip in magnetically-substituted graphene nanoribbons: Toward the realization of graphene-based spintronic devices
Gregory Houchins, Charles B. Crook, Jian-Xin Zhu +2
We examine the possibility of using graphene nanoribbons (GNRs) with directly substituted chromium atoms as spintronic device. Using density functional theory, we simulate a voltag…
Computational investigation of the electronic and optical properties of planar Ga-doped Graphene
Nicole Creange, Costel Constantin, Jian-Xin Zhu +2
We simulate the optical and electrical responses in gallium-doped graphene. Using density functional theory with a local density approximation, we simlutate the electronic band str…
Proximity-induced magnetism in transition-metal substituted graphene
Charles B. Crook, Costel Constantin, Towfiq Ahmed +3
We investigate the interactions between two identical magnetic impurities substituted into a graphene superlattice. Using a first-principles approach, we calculate the electronic a…
Generalization of polarized spin excitations for asymmetric dimeric systems
G. Houchins, J. T. Haraldsen
Through the use of Heisenberg spin-spin interactions, we provide analytical representations for inelastic neutron scattering eigenstates and excitation cross-sections of the genera…
Induced magnetization in LaSrMnO/BiFeO superlattices
S. Singh, J. T. Haraldsen, J. Xiong +14
Using polarized neutron reflectometry (PNR), we observe an induced magnetization of 75 25 kA/m at 10 K in a LaSrMnO (LSMO)/BiFeO superlattice extending…
Induced Ferromagnetism at BiFeO3/YBa2Cu3O7 Interfaces
Jian-Xin Zhu, Xiao-Dong Wen, J. T. Haraldsen +3
Transition metal oxides (TMOs) exhibit many emergent phenomena ranging from high-temperature superconductivity and giant magnetoresistance to magnetism and ferroelectricity. In add…
Next Generation Epigenetic Detection Technique:Identifying Methylated DNA using Graphene Nanopore
Towfiq Ahmed, Jason T. Haraldsen, Jian-Xin Zhu +1
DNA methylation plays a pivotal role in the genetic evolution of both embryonic and adult cells. For adult somatic cells, location and dynamics of methylation has been very precise…
Nuclear magnetic resonance studies of pseudospin fluctuations in URuSi
K. R. Shirer, J. T. Haraldsen, A. P. Dioguardi +13
We report Si NMR measurements in single crystals and aligned powders of URuSi in the hidden order and paramagnetic phases. The spin-lattice-relaxation data reveal ev…
Correlation Dynamics and Enhanced Signals for Serial DNA Sequencing
Towfiq Ahmed, Jason T. Haraldsen, John J. Rehr +3
Nanopore based sequencing has demonstrated significant potential for the development of fast, accurate, and cost-efficient fingerprinting techniques for next generation molecular d…