Roton energy gap and spontaneous symmetry breaking

Details Roton energy gap and spontaneous symmetry breaking Roton energy gap and spontaneous symmetry breaking

2009-11-09

arxiv.org/abs/0911.1599v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

We study elementary excitations in superfluid helium-4 employing an approach based on the spontaneous symmetry breaking. In particular, we calculate the roton energy gap at zero temperature $\Delta (0)$. The relation that we have derived is $\Delta (0) / k_B T_\lambda = 4$. The theoretical value of $\Delta (0)/k_B$ is 8.707 K, which is significantly close to the experimental value of 8.712 K. The deviation between the theoretical and experimental values is less than 0.1%.

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