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Title

Valence-bond spin-liquid state in two-dimensional frustrated spin-1/2 Heisenberg antiferromagnets

Author(s)

Zhang, Guang-Ming;  Hu, Hui;  Yu, Lu

Abstract

Fermionic valence-bond approach in terms of SU(4) representation is proposed to describe the J1-J2 frustrated Heisenberg antiferromagnetic (AF) model on a bipartite square lattice. A uniform mean field solution without breaking the translational and rotational symmetries describes a valence-bond spin-liquid state, interpolating the two different AF ordered states in the large J1 and large J2 limits, respectively. This novel spin-liquid state is gapless with the vanishing density of states at the Fermi nodal points. Moreover, a sharp resonance peak in the dynamic structure factor is predicted for momenta q=(0,0) and (π,π)

Publication type

Journal article

Source

Physical Review Letters, Vol. 91, no. 6 (Aug 2003), article no. 067201

Publication year

2003

FOR Code(s)

01 Mathematical Sciences;  02 Physical Sciences;  09 Engineering

Keyword(s)

Antiferromagnetic materials;  Band structure;  Computer simulation;  Dynamic spin structure factor;  Electron resonance;  Electronic density of states;  Fermionic valence bond;  Fermions;  Green's function;  Ground state;  Lagrange multipliers;  Mathematical models;  Neutron scattering;  Numerical analysis;  Quantum theory;  Rotational symmetry;  Spin density wave;  Translational symmetry;  Valence bond spin liquid state

Publisher

American Physical Society

ISSN

0031-9007

Publisher URL

http://dx.doi.org/10.1103/PhysRevLett.91.067201

Copyright

Copyright © 2003 The American Physical Society. The accepted manuscript of the paper is reproduced here for noncommerical purposes only in accordance with the copyright policy of the publisher.

Full text

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