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Nematic Ferromagnetism on the Lieb Lattice |
| CHEN Ke-Ji1,2, ZHANG Wei1,2** |
1Department of Physics, Renmin University of China, Beijing 100872
2Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872
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| Cite this article: |
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CHEN Ke-Ji, ZHANG Wei 2014 Chin. Phys. Lett. 31 110303 |
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Abstract We discuss the properties of ferromagnetic orders on the Lieb lattice and show that a symmetry protected quadratic-flat band crossing point will dramatically affect the magnetic ordering. In the presence of a weak on-site repulsive interaction, the ground state is a nematic ferromagnetic order with simultaneously broken time-reversal and rotational symmetries. When the interaction strength increases, the rotational symmetry will restore at a critical value, and the system enters a conventional ferromagnetic regime. The mean-field transition temperatures for both the nematic and conventional ferromagnetic phases are in the order of interaction. This observation suggests that these magnetic orders have the potential to be realized and detected in cold atomic systems within realistic experimental conditions.
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Published: 28 November 2014
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| PACS: |
03.75.Ss
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(Degenerate Fermi gases)
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37.10.Jk
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(Atoms in optical lattices)
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05.30.Fk
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(Fermion systems and electron gas)
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