Search results for "Metallic hydrogen"

showing 2 items of 2 documents

Metal-Insulator Transition of Solid Hydrogen by the Antisymmetric Shadow Wave Function

2016

We revisit the pressure-induced metal-insulator-transition of solid hydrogen by means of variational quantum Monte Carlo simulations based on the antisymmetric shadow wave function. In order to facilitate studying the electronic structure of large-scale fermionic systems, the shadow wave function formalism is extended by a series of technical improvements, such as a revised optimization method for the employed shadow wave function and an enhanced treatment of periodic systems with long-range interactions. It is found that the superior accuracy of the antisymmetric shadow wave function results in a significantly increased transition pressure.

Quantum Monte CarloGeneral Physics and AstronomyFOS: Physical sciences02 engineering and technologyElectronic structure01 natural sciencesSuperconductivity (cond-mat.supr-con)Condensed Matter - Strongly Correlated ElectronsSolid hydrogen0103 physical sciencesShadowPhysical and Theoretical ChemistryMetal–insulator transition010306 general physicsWave functionMathematical PhysicsPhysicsCondensed Matter - Materials ScienceQuantum PhysicsStrongly Correlated Electrons (cond-mat.str-el)Antisymmetric relationCondensed Matter - SuperconductivityMaterials Science (cond-mat.mtrl-sci)Metallic hydrogenComputational Physics (physics.comp-ph)021001 nanoscience & nanotechnology3. Good healthQuantum electrodynamics0210 nano-technologyQuantum Physics (quant-ph)Physics - Computational Physics
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Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system.

2015

A superconductor is a material that can conduct electricity without resistance below a superconducting transition temperature, Tc. The highest Tc that has been achieved to date is in the copper oxide system: 133 kelvin at ambient pressure and 164 kelvin at high pressures. As the nature of superconductivity in these materials is still not fully understood (they are not conventional superconductors), the prospects for achieving still higher transition temperatures by this route are not clear. In contrast, the Bardeen-Cooper-Schrieffer theory of conventional superconductivity gives a guide for achieving high Tc with no theoretical upper bound--all that is needed is a favourable combination of …

SuperconductivityMultidisciplinaryRoom-temperature superconductorCondensed matter physicsHydrogenChemistryTransition temperaturechemistry.chemical_elementMineralogyMetallic hydrogenMagnetic susceptibilityElectrical resistivity and conductivityCondensed Matter::SuperconductivityDensity of statesNature
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