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Q = 0order in quantum kagome Heisenberg antiferromagnet
Kallol Mondal1, Charudatt Kadolkar1
1Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
Abstract:
We have studied the nearest neighbor Heisenberg model with added Dzyaloshinskii-Moriya interaction using Schwinger boson mean-field theory considering the in-plane component as well as out-of-plane component. Motivated by the experimental result of vesignieite that the ground state is in aQ = 0long-range order state, we first looked at the classical ground state of the model and considered the mean-field ansatz which mimics the classical ground state in the largeSlimit. We have obtained the ground-state phase diagram of this model and calculated properties of different phases. We have also studied the above model numerically using exact diagonalization up to a system sizeN= 30. We have compared the obtained results from these two approaches. Our results are in agreement with the experimental result of the vesignieite.
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