Quantum phase transitions in the Kitaev--Heisenberg model on a single hexagon
arXiv:1503.08204 · doi:10.12693/APhysPolA.127.318
Abstract
We present a detailed analysis of the Kitaev--Heisenberg model on a single hexagon. The energy spectra and spin--spin correlations obtained using exact diagonalisation indicate quantum phase transitions between antiferromagnetic and anisotropic spin correlations when the Kitaev interactions increase. In cluster mean-field approach frustrated nearest neighbor exchange stabilizes the stripe phase in between the Néel phase and frustrated one which evolves towards the Kitaev spin liquid.
3 pages, 3 figures, Euroconference Physics of Magnetism, Poznań 2014
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