Effects of Zeeman field on a Spin Bose-Metal phase

Details Effects of Zeeman field on a Spin Bose-Metal phase Effects of Zeeman field on a Spin Bose-Metal phase

2010-06-08

arxiv.org/abs/1006.1625v2

Phys. Rev. B 82, 125116 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.82.125116

We consider Zeeman field effects on a Spin Bose-Metal (SBM) phase on a two-leg triangular ladder. This phase was found in a spin-1/2 model with ring exchanges [D. N. Sheng et. al., Phys. Rev. B {\bf 79}, 205112 (2009)], and was also proposed to appear in an interacting electronic model with longer-ranged repulsion [Lai et. al., Phys. Rev. B {\bf 81}, 045105 (2010)]. Using bosonization of a spinon-gauge theory, we study the stability of the SBM phase and its properties under the field. We also explore phases arising from potential instabilities of the SBM; in all cases, we find a gap to spin-1 excitations while spin-nematic correlations are power law. We discuss two-dimensional analogues of these phases where spinons can pair with their own species.

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