Low-density Phase Diagram of the Three-Dimensional Electron Gas

• URL: http://arxiv.org/abs/2201.08743v3
• Date: Thu, 16 Jun 2022 08:41:51 GMT
• Title: Low-density Phase Diagram of the Three-Dimensional Electron Gas
• Authors: Sam Azadi and N.D. Drummond
• Abstract summary: Variational and diffusion quantum Monte Carlo methods are employed to investigate the zero-temperature phase diagram of the homogeneous electron gas at very low density. Results show that the electron gas undergoes a first-order quantum phase transition directly from a paramagnetic fluid to a body-centered cubic crystal.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Variational and diffusion quantum Monte Carlo methods are employed to investigate the zero-temperature phase diagram of the three-dimensional homogeneous electron gas at very low density. Fermi fluid and body-centered cubic Wigner crystal ground state energies are determined using Slater-Jastrow-backflow and Slater-Jastrow many-body wave functions at different densities and spin polarizations in finite simulation cells. Finite-size errors are removed using twist-averaged boundary conditions and extrapolation of the energy per particle to the thermodynamic limit of infinite system size. Unlike previous studies, our results show that the electron gas undergoes a first-order quantum phase transition directly from a paramagnetic fluid to a body-centered cubic crystal at density parameter $r_\text{s} = 86.6(7)$, with no region of stability for an itinerant ferromagnetic fluid. However there is a possible magnetic phase transition from an antiferromagnetic crystal to a ferromagnetic crystal at $r_\text{s}=93(3)$.

Related papers

• Ferromagnetic semimetal and charge-density wave phases of interacting electrons in a honeycomb moiré potential [11.888482610984967]
  We study the two-dimensional electron gas on a honeycomb moir'e lattice at quarter filling. With increasing moir'e potential, the systems transitions from a paramagnetic metal to an itinerant ferromagnetic semimetal.
  arXiv  Detail & Related papers  (2024-06-03T18:19:38Z)
• Quantum Monte Carlo study of the phase diagram of the two-dimensional uniform electron liquid [0.0]
  We present a study of spin-unpolarized and spin-polarized two-dimensional uniform electron liquids using variational and diffusion quantum Monte Carlo methods. Ground-state VMC and DMC energies are obtained in the density range $1 leq r_texts leq 40$.
  arXiv  Detail & Related papers  (2024-05-01T10:15:45Z)
• Correlation energy of the spin-polarized electron liquid by quantum Monte Carlo [0.0]
  We report ground state VMC and DMC energies in the density range $0.5 leq r_texts leq 20$. The DMC energies in the thermodynamic limit are used to parameterize a local spin density approximation correlation function for inhomogeneous electron systems.
  arXiv  Detail & Related papers  (2023-06-23T10:24:59Z)
• Imaging magnetism evolution of magnetite to megabar pressure range with quantum sensors in diamond anvil cell [57.91882523720623]
  We develop an in-situ magnetic detection technique at megabar pressures with high sensitivity and sub-microscale spatial resolution. We observe the macroscopic magnetic transition of Fe3O4 in the megabar pressure range from strong ferromagnetism (alpha-Fe3O4) to weak ferromagnetism (beta-Fe3O4) and finally to non-magnetism (gamma-Fe3O4) The presented method can potentially investigate the spin-orbital coupling and magnetism-superconductivity competition in magnetic systems.
  arXiv  Detail & Related papers  (2023-06-13T15:19:22Z)
• Dynamics of molecular rotors in bulk superfluid helium [68.8204255655161]
  We report on the experimental study of the laser-induced rotation of helium dimers inside the superfluid $4mathrmHe$ bath at variable temperature. The observed temperature dependence suggests a non-equilibrium evolution of the quantum bath, accompanied by the emission of the wave of second sound.
  arXiv  Detail & Related papers  (2023-04-08T01:22:19Z)
• Correlation energy of the paramagnetic electron gas at the thermodynamic limit [0.0]
  We calculate correlation energy of paramagnetic three-dimensional homogeneous electron gas at intermediate to high density. Ground state energies in finite cells are determined using Slater-Jastrow-backflow trial wave functions. Our correlation energies in the thermodynamic limit are lower (i.e., more negative, and therefore more accurate according to the variational principle) than previous results.
  arXiv  Detail & Related papers  (2022-09-21T09:43:20Z)
• Quantum mean-field treatment of the dynamics of a two-level atom in a simple cubic lattice [0.0]
  Entanglement sudden death and revival is shown to occur close to the critical temperature. The dependence on the change of the temperature and the magnitude of spin is also investigated.
  arXiv  Detail & Related papers  (2022-06-28T17:03:48Z)
• Engineering the Radiative Dynamics of Thermalized Excitons with Metal Interfaces [58.720142291102135]
  We analyze the emission properties of excitons in TMDCs near planar metal interfaces. We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude. nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
  arXiv  Detail & Related papers  (2021-10-11T19:40:24Z)
• Rotating Majorana Zero Modes in a disk geometry [75.34254292381189]
  We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor. We analyze the second-order topological corner modes that arise when an in-plane magnetic field is applied. We show that oscillations persist even in the adiabatic phase because of a frequency independent coupling between zero modes and excited states.
  arXiv  Detail & Related papers  (2021-09-08T11:18:50Z)
• Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite [50.591267188664666]
  We reveal a rich ground state phase diagram even at the classical level. The presented model opens a new direction in the study of kagome antiferromagnets.
  arXiv  Detail & Related papers  (2021-07-28T18:00:03Z)
• Photon Condensation and Enhanced Magnetism in Cavity QED [68.8204255655161]
  A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition. The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model. A transmission experiment is shown to resolve the transition, measuring the quantum electrodynamical control of magnetism.
  arXiv  Detail & Related papers  (2020-11-07T11:18:24Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.