Excited electron-bubble states in superfluid helium-4: a time-dependent density functional approach

Abstract

We present a systematic study on the excited electron-bubble states in superfluid helium-4 using a time-dependent density functional approach. For the evolution of the 1P bubble state, two different functionals accompanied with two different time-development schemes are used, namely an accurate finite-range functional for helium with an adiabatic approximation for electron versus an efficient zero-range functional for helium with a real-time evolution for electron. We make a detailed comparison between the quantitative results obtained from the two methods, which allows us to employ with confidence the optimal method for suitable problems. Based on this knowledge, we use the finite-range functional to calculate the time-resolved absorption spectrum of the 1P bubble, which in principle can be experimentally determined, and we use the zero-range functional to real-time evolve the 2P bubble for several hundreds of picoseconds, which is theoretically interesting due to the break down of adiabaticity for this state. Our results discard the physical realization of relaxed, metastable 2P electron-bubbles

16 pages, 12 figures

References in corpus (6)

• Structural and dynamical properties of superfluid helium: a density functional approach
• Density of Superfluid Helium Droplets
• Excited electron-bubble states in superfluid helium-4: a time-dependent density functional approach
• Dynamics of liquid He-4 in confined geometries from Time-Dependent Density Functional calculations
• Evolution of the excited electron bubble in liquid 4He and the appearance of fission-like processes
• Vortex Nucleation Induced Phonon Radiation from a Moving Electron Bubble in Superfluid 4He

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• The onset of nanoscale dissipation in superfluid He-4 at zero temperature: the role of vortex shedding and cavitation
• Theoretical framework bridging classical and quantum mechanics for the dynamics of cryogenic liquid helium-4 using smoothed-particle hydrodynamics
• Density functional theory modeling of vortex shedding in superfluid He-4