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Bosons in fluctuating gauge fields: Bose metal and phase separation

Robert L. Jack·Derek K. K. Lee
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Abstract

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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Robert L. Jack, Derek K. K. Lee. 2002-08-27. Bosons in fluctuating gauge fields: Bose metal and phase separation. https://doi.org/10.1103/physrevb.66.104526

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