Ross H. McKenzie
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View article: Spin-0 Mott insulator to metal to spin-1 Mott insulator transition in the single-orbital Hubbard model on the decorated honeycomb lattice
Spin-0 Mott insulator to metal to spin-1 Mott insulator transition in the single-orbital Hubbard model on the decorated honeycomb lattice Open
We study the interplay of strong electron correlations and intra-triangle\nspin exchange at two-thirds filling of the single-orbital Hubbard model on the\ndecorated honeycomb lattice using rotationally invariant slave bosons. We find\nthat…
View article: Multiple insulating states due to the interplay of strong correlations and lattice geometry in a single-orbital Hubbard model
Multiple insulating states due to the interplay of strong correlations and lattice geometry in a single-orbital Hubbard model Open
We report ten ground states arising from strong correlations in the\nsingle-orbital Hubbard model on the decorated honeycomb lattice; including\nDirac metals, flat-band ferromagnets, real-space Mott insulators, dimer and\ntrimer Mott insul…
View article: Evaluation of a sprayable elemental sulfur fertilizer under field conditions in Alberta
Evaluation of a sprayable elemental sulfur fertilizer under field conditions in Alberta Open
Elemental sulfur (ES) fertilizers have high S content but may not be effective in the year of application due to the time required to oxidize. Rapid oxidation may be possible if the ES has a large surface area in contact with the soil. We …
View article: Hidden Devil's staircase in a two-dimensional elastic model of spin crossover materials
Hidden Devil's staircase in a two-dimensional elastic model of spin crossover materials Open
Spin crossover (SCO) materials are reversible molecular switches found in a wide range of transition metal complexes and metal organic frameworks (MOFs). They exhibit diverse spin state orderings and transitions between them. We present an…
View article: Equivalence of elastic and Ising models for spin crossover materials
Equivalence of elastic and Ising models for spin crossover materials Open
Spin crossover (SCO) materials are reversible molecular switches; and occur in a wide range of near octahedral transition metal complexes and frameworks with $d^4-d^7$ electron configurations. SCO systems present collective spin-state phas…
View article: Orbital-selective bad metals due to Hund's rule and orbital anisotropy: A finite-temperature slave-spin treatment of the two-band Hubbard model
Orbital-selective bad metals due to Hund's rule and orbital anisotropy: A finite-temperature slave-spin treatment of the two-band Hubbard model Open
We study the finite-temperature properties of the half-filled two-band\nHubbard model in the presence of Hund's rule coupling and orbital anisotropy.\nWe use the mean-field treatment of the $Z_2$ slave-spin theory with a\nfinite-temperatur…
View article: Fertigation of wheat and canola in southern Alberta
Fertigation of wheat and canola in southern Alberta Open
An irrigation study in southern Alberta compared spring-banded nitrogen (N) to spring-banded N plus fertigation at three plant growth stages for spring wheat (Triticum aestivum L.) and canola (Brassica napus L.). Yield and quality impacts …
View article: Low quasiparticle coherence temperature in the one-band Hubbard model: A slave-boson approach
Low quasiparticle coherence temperature in the one-band Hubbard model: A slave-boson approach Open
We use the Kotliar-Ruckenstein slave-boson formalism to study the temperature dependence of paramagnetic phases of the one-band Hubbard model for a variety of band structures. We calculate the Fermi liquid quasiparticle spectral weight $Z$…
View article: Quantum critical local spin dynamics near the Mott metal-insulator transition in infinite dimensions
Quantum critical local spin dynamics near the Mott metal-insulator transition in infinite dimensions Open
Finding microscopic models for metallic states that exhibit quantum critical\nproperties such as $\\omega/T$ scaling is a major theoretical challenge. We\ncalculate the local dynamical spin susceptibility $\\chi(T,\\omega)$ for a\nHubbard …
View article: Diabatic models with transferrable parameters for generalized chemical reactions
Diabatic models with transferrable parameters for generalized chemical reactions Open
Diabatic models applied to adiabatic electron-transfer theory yield many equations involving just a few parameters that connect ground-state geometries and vibration frequencies to excited-state transition energies and vibration frequencie…
View article: Becoming Visionary: Evaluation of a Comprehensive Eye Exam Clinic Within a Geriatric Rehabilitation Setting
Becoming Visionary: Evaluation of a Comprehensive Eye Exam Clinic Within a Geriatric Rehabilitation Setting Open
In the older adult population, visual impairments are highly prevalent, but largely undiagnosed. Research has shown that such visual impairments increase the risk of falls, depression, and mortality amongst older adults. Studies are lackin…
View article: Effect of seeding date and rate on malting barley (<i></i>Hordeum vulgare<i></i> L.) quality
Effect of seeding date and rate on malting barley (<i></i>Hordeum vulgare<i></i> L.) quality Open
A field study conducted over three years in western Canada investigated the effects of seeding date and rate on malting quality of AC Metcalfe barley. Seeding date had little or no effect on quality. Increasing the seeding rate improved se…
View article: Influence of production systems on return and risk from malting barley production in western Canada
Influence of production systems on return and risk from malting barley production in western Canada Open
Profitable malting barley (Hordeum vulgare L.) production systems are required to reverse the decline in area seeded to malting barley in western Canada. Systems that could increase the profitability of growing malting barley considered th…
View article: Nuclear Quantum Effects in Water and Aqueous Systems: Experiment, Theory, and Current Challenges
Nuclear Quantum Effects in Water and Aqueous Systems: Experiment, Theory, and Current Challenges Open
Nuclear quantum effects influence the structure and dynamics of hydrogen-bonded systems, such as water, which impacts their observed properties with widely varying magnitudes. This review highlights the recent significant developments in t…
View article: Holon-doublon binding as the mechanism for the Mott transition
Holon-doublon binding as the mechanism for the Mott transition Open
We study the binding of a holon to a doublon in a half-filled Hubbard model\nas the mechanism of the zero-temperature metal-insulator transition. In a spin\npolarized system and a non-bipartite lattice a single holon-doublon (HD) pair\nexh…
View article: Shear viscosity of strongly interacting fermionic quantum fluids
Shear viscosity of strongly interacting fermionic quantum fluids Open
Eighty years ago Eyring proposed that the shear viscosity of a liquid, $\eta$, has a quantum limit $\eta \gtrsim n\hbar$ where $n$ is the density of the fluid. Using holographic duality and the AdS/CFT correspondence in string theory Kovtu…
View article: Enhancement of thermal expansion of organic charge-transfer salts by strong electronic correlations
Enhancement of thermal expansion of organic charge-transfer salts by strong electronic correlations Open
Organic charge transfer salts exhibit thermal expansion anomalies similar to those found in other strongly correlated electron systems. The thermal expansion can be anisotropic and have a non-monotonic temperature dependence. We show how t…
View article: Enhancement of the thermoelectric power by electronic correlations in bad metals: A study of the Kelvin formula
Enhancement of the thermoelectric power by electronic correlations in bad metals: A study of the Kelvin formula Open
In many strongly correlated electron metals the thermoelectric power has a\nnon-monotonic temperature dependence and values that are orders of magnitude\nlarger than for elemental metals. Kelvin proposed a particularly simple\nexpression f…
View article: Valence-bond non-equilibrium solvation model for a twisting monomethine cyanine
Valence-bond non-equilibrium solvation model for a twisting monomethine cyanine Open
We propose and analyze a two-state valence-bond model of non-equilibrium solvation effects on the excited-state twisting reaction of monomethine cyanines. Suppression of this reaction is thought responsible for environment-dependent fluore…
View article: Absence of a quantum limit to charge diffusion in bad metals
Absence of a quantum limit to charge diffusion in bad metals Open
Good metals are characterised by diffusive transport of coherent quasi-particle states and the resistivity is much less than the Mott-Ioffe-Regel (MIR) limit, $\frac{ha}{e^{2}}$, where $a$ is the lattice constant. In bad metals, such as ma…
View article: Non-adiabatic effects in thermochemistry, spectroscopy and kinetics: the general importance of all three Born–Oppenheimer breakdown corrections
Non-adiabatic effects in thermochemistry, spectroscopy and kinetics: the general importance of all three Born–Oppenheimer breakdown corrections Open
Analytical and numerical solutions describing Born–Oppenheimer breakdown in a simple, widely applicable, model depict shortcomings in modern computational methods.