Quantum disordered phase on the frustrated honeycomb lattice

Details Quantum disordered phase on the frustrated honeycomb lattice Quantum disordered phase on the frustrated honeycomb lattice

2010-03-16

arxiv.org/abs/1003.3226v5

Phys. Rev. B 83, 094506 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevB.83.094506

In the present paper we study the phase diagram of the Heisenberg model on the honeycomb lattice with antiferromagnetic interactions up to third neighbors along the line $J_2=J_3$ that include the point $J_2=J_3=J_1/2$, corresponding to the highly frustrated point where the classical ground state has macroscopic degeneracy. Using the Linear Spin-Wave, Schwinger boson technique followed by a mean field decoupling and exact diagonalization for small systems we find an intermediate phase with a spin gap and short range N\'eel correlations in the strong quantum limit (S=1/2). All techniques provide consistent results which allow us to predict the existence of a quantum disordered phase, which may have been observed in recent high-field ESR measurements in manganites.

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