Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-11-10
Phys.Rev.D81:126011,2010
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, 17 figure files, LaTeX
Scientific paper
10.1103/PhysRevD.81.126011
We begin an investigation of inhomogeneous structures in holographic superfluids. As a first example, we study domain wall like defects in the 3+1 dimensional Einstein-Maxwell-Higgs theory, which was developed as a dual model for a holographic superconductor. In [1], we reported on such "dark solitons" in holographic superfluids. In this work, we present an extensive numerical study of their properties, working in the probe limit. We construct dark solitons for two possible condensing operators, and find that both of them share common features with their standard superfluid counterparts. However, both are characterized by two distinct coherence length scales (one for order parameter, one for charge condensate). We study the relative charge depletion factor and find that solitons in the two different condensates have very distinct depletion characteristics. We also study quasiparticle excitations above the holographic superfluid, and find that the scale of the excitations is comparable to the soliton coherence length scales.
Keranen Ville
Keski-Vakkuri Esko
Nowling Sean
Yogendran K. P.
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