ORCID Profile
0000-0002-6548-4902
Current Organisation
Universitat Politecnica de Catalunya
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Publications
Zero-temperature equation of state of solid 4He at low and high pressures
Publisher: IOP Publishing
Date: 12-12-2008
Instability of vacancy clusters in solid 4He
Publisher: Springer Science and Business Media LLC
Date: 10-10-2010
Two-dimensional molecular para-hydrogen and ortho-deuterium at zero temperature
Publisher: American Physical Society (APS)
Date: 08-10-2008
A Microscopic Description of Vacancies in Solid 4He
Publisher: Springer Science and Business Media LLC
Date: 21-03-2012
Excitonic insulator to superconductor phase transition in ultra-compressed helium
Publisher: Springer Science and Business Media LLC
Date: 25-07-2023
DOI: 10.1038/S41467-023-40240-X
Abstract: Helium, the second most abundant element in the universe, exhibits an extremely large electronic band gap of about 20 eV at ambient pressures. While the metallization pressure of helium has been accurately determined, thus far little attention has been paid to the specific mechanisms driving the band-gap closure and electronic properties of this quantum crystal in the terapascal regime (1 TPa = 10 Mbar). Here, we employ density functional theory and many-body perturbation calculations to fill up this knowledge gap. It is found that prior to reaching metallicity helium becomes an excitonic insulator (EI), an exotic state of matter in which electrostatically bound electron-hole pairs may form spontaneously. Furthermore, we predict metallic helium to be a superconductor with a critical temperature of ≈ 20 K just above its metallization pressure and of ≈ 70 K at 100 TPa. These unforeseen phenomena may be critical for improving our fundamental understanding and modeling of celestial bodies.
Leveraging genome-wide data to investigate differences between opioid use vs. opioid dependence in 41,176 individuals from the Psychiatric Genomics Consortium
Publisher: Springer Science and Business Media LLC
Date: 26-02-2020
Elastic constants of solid4
Publisher: American Physical Society (APS)
Date: 04-01-2012
H2 Physisorbed on Graphane
Publisher: Springer Science and Business Media LLC
Date: 16-11-2012
Superfluidity versus localization in bulkHe
Publisher:
American Physical Society (APS)
Date:
19-06-2006
Publisher: American Physical Society (APS)
Date: 19-06-2006
Supersolidity in quantum films adsorbed on graphene and graphite
Publisher: American Physical Society (APS)
Date: 17-03-2011
Ground-state properties and superfluidity of two- and quasi-two-dimensional solid4He
Publisher: IOP Publishing
Date: 30-03-2010
DOI: 10.1088/0953-8984/22/16/165402
Abstract: In a recent study we have reported a new type of trial wavefunction symmetric under the exchange of particles, which is able to describe a supersolid phase. In this work, we use the diffusion Monte Carlo method and this model wavefunction to study the properties of solid (4)He in two- and quasi-two-dimensional geometries. In the purely two-dimensional (2D) case, we obtain results for the total ground-state energy and freezing and melting densities which are in good agreement with previous exact Monte Carlo calculations performed with a slightly different interatomic potential model. We calculate the value of the zero-temperature superfluid fraction ρ(s)/ρ of 2D solid (4)He and find that it is negligible in all the considered cases, similarly to what is obtained in the perfect (free of defects) three-dimensional crystal using the same computational approach. Interestingly, by allowing the atoms to move locally in the direction perpendicular to the plane where they are confined to zero-point oscillations (quasi-2D crystal), we observe the emergence of a finite superfluid density that coexists with the periodicity of the system.
Absence of Off-Diagonal Long-Range Order in hcp
He
Publisher:
American Physical Society (APS)
Date:
03-01-2023
Publisher: American Physical Society (APS)
Date: 03-01-2023
Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium
Publisher: American Physical Society (APS)
Date: 03-12-2013
Quantum Monte Carlo Simulation of Overpressurized LiquidHe
Publisher: American Physical Society (APS)
Date: 30-09-2005
Atomic kinetic energy, momentum distribution, and structure of solid neon at zero temperature
Publisher: American Physical Society (APS)
Date: 30-01-2008
Elastic constants of incommensurate solid4
Publisher: American Physical Society (APS)
Date: 28-06-2013
Properties of vacancy formation in hcpH
Publisher:
American Physical Society (APS)
Date:
04-11-2010
Publisher: American Physical Society (APS)
Date: 04-11-2010
Bose–Einstein quantum statistics and the ground state of solid4He
Publisher: IOP Publishing
Date: 26-01-2009
Quantum hydrogen vibrational dynamics in LiH: Neutron-scattering measurements and variational Monte Carlo simulations
Publisher: American Physical Society (APS)
Date: 13-05-2004
Isotopic Effects in Solid LiH and LiD at Very Low Temperature
Publisher: Springer Science and Business Media LLC
Date: 06-2005
Zero-temperature phase diagram of D2 physisorbed on graphane
Publisher: IOP Publishing
Date: 16-10-2013
DOI: 10.1088/0953-8984/25/44/445011
Abstract: We determined the zero-temperature phase diagram of D₂ physisorbed on graphane using the diffusion Monte Carlo method. The substrate used was C-graphane, an allotropic form of the compound that has been experimentally obtained through hydrogenation of graphene. We found that the ground state is the δ phase, a commensurate structure observed experimentally when D₂ is adsorbed on graphite, and not the registered √3 x √3 structure characteristic of H₂ on the same substrate.
Related Organisations
Indiana University-Purdue University Indianapolis
Location: United States of America
School Of Medicine, Indiana University
Location: United States of America
Related Funding Activities
No related grants have been discovered for Jeanette McClintick.