Quantized vortices in $^{\bf 4}$He droplets: a quantum Monte Carlo study

Details Quantized vortices in $^{\bf 4}$He droplets: a quantum Monte Carlo study Quantized vortices in $^{\bf 4}$He droplets: a quantum Monte Carlo study

2007-06-14

arxiv.org/abs/0706.2125v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.052507

We present a diffusion Monte Carlo study of a vortex line excitation attached to the center of a $^4$He droplet at zero temperature. The vortex energy is estimated for droplets of increasing number of atoms, from N=70 up to 300 showing a monotonous increase with $N$. The evolution of the core radius and its associated energy, the core energy, is also studied as a function of $N$. The core radius is $\sim 1$ \AA in the center and increases when approaching the droplet surface; the core energy per unit volume stabilizes at a value 2.8 K$\sigma^{-3}$ ($\sigma=2.556$ \AA) for $N \ge 200$.

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