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19 papers · 1 filter
Neutral band gap of carbon by quantum Monte Carlo methods
V. Gorelov, Y. Yang, M. Ruggeri +3
We present a method of calculating the energy gap of a charge-neutral excitation using only ground-state calculations. We report Quantum Monte Carlo calculations of …
Multi-scale simulation of the adsorption of lithium ion on graphite surface: from Quantum Monte Carlo to Molecular Density Functional Theory
Michele Ruggeri, Kyle Reeves, Tzu-Yao Hsu +3
The structure of the double-layer formed at the surface of carbon electrodes is governed by the interactions between the electrode and the electrolyte species. However, carbon is n…
Electronic structure and optical properties of quantum crystals from first principles calculations in the Born-Oppenheimer approximation
Vitaly Gorelov, David M. Ceperley, Markus Holzmann +1
We develop a formalism to accurately account for the renormalization of electronic structure due to quantum and thermal nuclear motions within the Born-Oppenheimer approximation. W…
Electronic energy gap closure and metal-insulator transition in dense liquid hydrogen
Vitaly Gorelov, David M. Ceperley, Markus Holzmann +1
Using Quantum Monte Carlo (QMC) calculations, we investigate the insulator-metal transition observed in liquid hydrogen at high pressure. Below the critical temperature of the tran…
Electronic band gaps from Quantum Monte Carlo methods
Yubo Yang, Vitaly Gorelov, Carlo Pierleoni +2
We develop a method for calculating the fundamental electronic gap of semiconductors and insulators using grand canonical Quantum Monte Carlo simulations. We discuss the origin of…
Energy gap closure of crystalline molecular hydrogen with pressure
Vitaly Gorelov, Markus Holzmann, David M. Ceperley +1
We study the gap closure with pressure of crystalline molecular hydrogen. The gaps are obtained from grand-canonical Quantum Monte Carlo methods properly extended to quantum and th…