Condensate-free superfluidity induced by frustrated proximity effect

Abstract

Since the discovery of superfluidity in He4 and Landau's phenomenological theory, the relationship between Bose condensation and superfluidity has been intensely debated. He4 is known by now to be both superfluid and condensed at low temperature, and more generally, in dimension D\geq2, all superfluid bosonic models realized in experiments are condensed in their ground-state, the most recent example being provided by ultracold bosonic atoms trapped in an optical lattice. In this paper, it is shown that a 2D gas of bosons which is not condensed at T=0 can be achieved by populating a layer through a frustrated proximity effect from a superfluid reservoir. This condensate-free bosonic fluid is further shown to be a superfluid with incommensurate correlations.

4 pages, 4 figures + supplementary file including experimental discussions (cold atoms + Han purple)

References in corpus (13)

• Many-Body Physics with Ultracold Gases
• Synthetic magnetic fields for ultracold neutral atoms
• Bose-Einstein Condensation in Magnetic Insulators
• Supersolid hardcore bosons on the triangular lattice
• Dimensional reduction at a quantum critical point
• D-wave correlated Critical Bose Liquids in two dimensions
• Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6
• Strong-Coupling Phases of Frustrated Bosons on a 2-leg Ladder with Ring Exchange
• Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
• Theory of the field-induced BEC in the frustrated spin-1/2 dimer compound BaCuSi2O6
• NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi${}_2$O${}_6$
• Quantum phase transitions and dimensional reduction in antiferromagnets with inter-layer frustration
• Can Frustration Preserve a Quasi-Two-Dimensional Spin Fluid?

Cited by in corpus (9)

• Magnetic frustration in BaCuSi2O6 released
• Bose glass transition and spin-wave localization for 2D bosons in a random potential
• Semiclassical approach to ground-state properties of hard-core bosons in two dimensions
• Magnetism of CuX2 frustrated chains (X = F, Cl, Br): the role of covalency
• Two energy scales of spin dimers in clinoclase Cu3(AsO4)(OH)3
• Spatially Resolved Magnetization in the Bose-Einstein Condensed State of BaCuSi2O6: Evidence for Imperfect Frustration
• Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi${}_2$O${}_6$
• Sliding phase in randomly stacked 2D superfluids/superconductors
• Scaling behaviour of trapped bosonic particles in two dimensions at finite temperature