Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-18
Phys. Rev. B 73, 174430 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
20 pages, 10 figures
Scientific paper
10.1103/PhysRevB.73.174430
We explore spin-1/2 triangular antiferromagnets with both easy-plane and lattice exchange anisotropies by employing a dual vortex mapping followed by a fermionization of the vortices. Over a broad range of exchange anisotropy, this approach leads naturally to a ``critical'' spin liquid--the algebraic vortex liquid--which appears to be distinct from other known spin liquids. We present a detailed characterization of this state, which is described in terms of non-compact QED3 with an emergent SU(4) symmetry. Descendant phases of the algebraic vortex liquid are also explored, which include the Kalmeyer-Laughlin spin liquid, a variety of magnetically ordered states such as the well known coplanar spiral state, and supersolids. In the range of exchange anisotropy where the ``square lattice'' Neel ground state arises, we demonstrate that anomalous ``roton'' minima in the excitation spectrum recently reported in series expansions can be accounted for within our approach.
Alicea Jason
Fisher Matthew P. A.
Motrunich Olexei I.
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