Bosons in fluctuating gauge fields: Bose metal and phase separation

Details Bosons in fluctuating gauge fields: Bose metal and phase separation Bosons in fluctuating gauge fields: Bose metal and phase separation

2002-03-13

arxiv.org/abs/cond-mat/0203274v2

Phys.Rev.B66:104526,2002

Physics

Condensed Matter

Superconductivity

8 pages, 7 figures, to appear in Phys Rev B

Scientific paper

10.1103/PhysRevB.66.104526

We study a two-dimensional system of bosons interacting with a fluctuating U(1) gauge field with overdamped dynamics. We find two instabilities of the condensed phase at T=0: one to phase separation and another to a homogeneous non-superfluid (Bose metal). The presence of both instabilities in the model is dependent on the low-energy form of the gauge field propagator. We discuss the relevance of our findings to the U(1) gauge theory of the t--J model.

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