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Metal-insulator transitions
Metal-insulator transitions are accompanied by huge resistivity changes, even over tens of orders of magnitude, and are widely observed in condensed-matter systems. This article presents theExpand
Frequency-dependent local interactions and low-energy effective models from electronic structure calculations
We propose a systematic procedure for constructing effective models of strongly correlated materials. The parameters, in particular the on-site screened Coulomb interaction $U$, are calculated fromExpand
Quantum Spin Liquid in Spin 1/2 J1–J2 Heisenberg Model on Square Lattice: Many-Variable Variational Monte Carlo Study Combined with Quantum-Number Projections
The nature of quantum spin liquids is studied for the spin-1/2 antiferromagnetic Heisenberg model on a square lattice containing exchange interactions between nearest-neighbor sites, J1, and thoseExpand
Ab initio studies on the interplay between spin-orbit interaction and Coulomb correlation in Sr2IrO4 and Ba2IrO4.
The results for A=Sr and Ba correctly reproduce paramagnetic metals undergoing continuous transitions to insulators below the Néel temperature T(N); these compounds are classified not into Mott insulators but into Slater insulators. Expand
Constructing exact representations of quantum many-body systems with deep neural networks
A technique to construct classical representations of many-body quantum systems based on artificial neural networks based on the deep Boltzmann machine architecture, based on which two layers of hidden neurons mediate quantum correlations are constructed. Expand
Orbital physics in the perovskite Ti oxides
Titanate compounds have been recognized as key materials for understanding the coupling of magnetism and orbitals in strongly correlated electron systems. In the perovskite Ti oxide RTiO3 (where RExpand
Clues and criteria for designing a Kitaev spin liquid revealed by thermal and spin excitations of the honeycomb iridate Na 2 IrO 3
Contrary to the original expectation, ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$ is not a Kitaev's quantum spin liquid (QSL) but shows a zigzag-type antiferromagnetic order in experiments. Here, weExpand
Dirac-type nodal spin liquid revealed by machine learning
Pursuing fractionalized particles that do not bear properties of conventional bare particles such as electrons or magnons is a challenge in physics. Here we show that machine-learning methods forExpand
Monte Carlo Calculation of Quantum Systems. II. Higher Order Correction
The higher order correction term is obtained for the Monte Carlo calculation of the path integral. The correction is expressed only by a modification of the potential term: \(V(\textbf{\itshapeExpand
Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe, and FeTe
Effective low-energy Hamiltonians for several different families of iron-based superconductors are compared after deriving them from the downfolding scheme based on first-principles calculations.Expand