61 citations · 382 across the 24 of their papers we have counts for
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cond-mat.other2009
Roton energy gap and spontaneous symmetry breaking
Junpei Harada
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 te…
cond-mat.other2007★ 4 cited
Spontaneous Symmetry Breaking in Superfluid Helium-4
Junpei Harada
We derive an analytical expression for a critical temperature of spontaneous symmetry breaking in a repulsive hard-core interacting Bose system. We show that the critical temperatu…