R. Scalettar

Publications453
h-index37
Citations5,187
Highly Influential Citations100
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First-order isostructural Mott transition in highly compressed MnO.
We present evidence for an isostructural, first-order Mott transition in MnO at 105+/-5 GPa, based on high-resolution x-ray emission spectroscopy and angle-resolved x-ray diffraction data. The…
Observation of antiferromagnetic correlations in the Hubbard model with ultracold atoms
Ultracold atoms in optical lattices have great potential to contribute to a better understanding of some of the most important issues in many-body physics, such as high-temperature superconductivity.…
Quantum Monte Carlo study of the two-dimensional fermion Hubbard model
We report large scale determinant quantum Monte Carlo calculations of the effective bandwidth, momentum distribution, and magnetic correlations of the square lattice fermion Hubbard Hamiltonian at…
Fermions in 2D optical lattices: temperature and entropy scales for observing antiferromagnetism and superfluidity.
TLDR
It is found that an entropy per particle approximately = ln2 is sufficient to observe the insulating gap in the repulsive Hubbard model at half-filling, or the pairing pseudogap in the attractive case, and double-occupancy measurements are useful for thermometry for temperatures greater than the nearest-neighbor hopping energy.
Local quantum criticality in confined fermions on optical lattices.
Using quantum Monte Carlo simulations, we show that the one-dimensional fermionic Hubbard model in a harmonic potential displays quantum critical behavior at the boundaries of a Mott-insulating…
Determinant quantum Monte Carlo study of the two-dimensional single-band Hubbard-Holstein model
We have performed numerical studies of the Hubbard-Holstein model in two dimensions using determinant quantum Monte Carlo (DQMC). Here, we present details of the method, emphasizing the treatment of…
Numerical Methods for Quantum Monte Carlo Simulations of the Hubbard Model
One of the core problems in materials science is how the interactions between electrons in a solid give rise to properties like ∗This work was partially supported by the National Science Foundation…
Phonon Dispersion and the Competition between Pairing and Charge Order.
TLDR
QMC studies of the role of phonon dispersion on SC and CDW order in Holstein models are reported and the effect of finite phonon bandwidth and curvature on the critical temperature T_{cdw} forCDW order is quantified.
Revisiting the Theory of Finite Size Scaling in Disordered Systems
For phase transitions in disordered systems, an exact theorem provides a bound on the finite size correlation length exponent: ${\ensuremath{\nu}}_{\mathrm{FS}}\ensuremath{\ge}2/d$. It is believed…
Stable matrix-multiplication algorithms for low-temperature numerical simulations of fermions
In this note, we discuss the use of matrix factorizations to stabilize the numerical matrix multiplications and inversions needed to simulate systems of interacting fermions at low temperatures.…
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