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Nature and strength of interlayer binding in graphite.
We compute the interlayer bonding properties of graphite using an ab initio many-body theory. We carry out variational and diffusion quantum Monte Carlo calculations and find an equilibriumExpand
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Semi-Metal-Insulator Transition of the Hubbard Model in the Honeycomb Lattice
Using quantum Monte Carlo and finite-size scaling for the Hubbard model, we find evidence of a zero-temperature transition between the nonmagnetic semi-metal and an antiferromagnetic insulator in theExpand
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Direct evidence for a gapless $Z_2$ spin liquid by frustrating Néel antiferromagnetism
By direct calculations of the spin gap in the frustrated Heisenberg model on the square lattice, with nearest- ($J_1$) and next-nearest-neighbor ($J_2$) super-exchange couplings, we provide a solidExpand
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Long-Range Néel Order in the Triangular Heisenberg Model
We have studied the Heisenberg model on the triangular lattice using several Quantum Monte Carlo (QMC) techniques (up to 144 sites), and exact diagonalization (ED) (up to 36 sites). By studying theExpand
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GREEN FUNCTION MONTE CARLO WITH STOCHASTIC RECONFIGURATION
A new method for the stabilization of the sign problem in the Green Function Monte Carlo technique is proposed. The method is devised for real lattice Hamiltonians and is based on an iterativeExpand
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Electron Localization in the Insulating State
The insulating state of matter is characterized by the excitation spectrum, but also by qualitative features of the electronic ground state. The insulating ground wavefunction in fact: (i) sustainsExpand
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Stable liquid hydrogen at high pressure by a novel Ab initio molecular-dynamics calculation.
We introduce an efficient scheme for the molecular dynamics of electronic systems by means of quantum Monte Carlo. The evaluation of the (Born-Oppenheimer) forces acting on the ionic positions isExpand
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Generalized Lanczos algorithm for variational quantum Monte Carlo
We show that the standard Lanczos algorithm can be efficiently implemented statistically and self-consistently improved, using the stochastic reconfiguration method, which has been recentlyExpand
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Absence of a Spin Liquid Phase in the Hubbard Model on the Honeycomb Lattice
TLDR
A spin liquid is a novel quantum state of matter with no conventional order parameter where a finite charge gap exists even though the band theory would predict metallic behavior. Expand
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Towards the solution of the many-electron problem in real materials: equation of state of the hydrogen chain with state-of-the-art many-body methods
We present numerical results for the equation of state of an infinite chain of hydrogen atoms. A variety of modern many-body methods are employed, with exhaustive cross-checks and validation.Expand
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