82 / 168
Abstracts
I3.3
Topology, emergent Ising order, and spontaneous symmetry breaking
in superfluid
3
He-B
Takeshi Mizushima
Department of Materials Engineering Science, Osaka University, Toyonaka,
Osaka 560-8531, Japan
Superfluid
3
He serves as a rich repository of topological quantum phenomena,
and the marriage of the prototypical topological superfluid with nanofabrication
techniques brings about a rich variety of spontaneous symmetry breaking, such
as a variety of Nambu-Goldstone modes and Higgs modes. In this talk, I review
the recent progress on understanding the nontrivial topological structure and
symmetry breaking of superfluid
3
He. This includes the emergence of Majorana
fermions, their quantum mass acquisition at the topological critical point, and
new bosonic modes bound to the surface. A key ingredient to understand these
novel phenomena is the emergence of the Ising order. I show that the emergent
Ising order spontaneously forms the domain wall by increasing a magnetic field
across the topological critical point.
O3.8
Spontaneous helical order of Cooper pairs in liquid
3
He
Wiman Joshua(1), Sauls J. A.(1)
1) Northwestern University, Department of Physics & Astronomy
Confined liquid
3
He is predicted to have superfluid phases which spontaneously
break the translational symmetry of their confining geometry. We predict a
superfluid phase with helical order that is energetically stable within narrow
cylindrical channels near Tc and at both high and low pressures. This helical
order is manifest in the supercurrent, which traces out a double-helix. Using a
strong-coupling Ginzburg-Landau (GL) theory that accurately reproduces the
bulk phase diagram, we present the phase diagram, including 5 other superfluid
phases, as a function of temperature, pressure, channel radius, and surface
conditions. We also discuss the transverse NMR signatures of this phase.
82