Journal
PHYSICAL REVIEW B
Volume 88, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.075101
Keywords
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Funding
- NSFC [11274032, 11104189, 11274033, 11074023, 11274044]
- FOK YING TUNG EDUCATION FOUNDATION
- Program for NCET
- Research Grant Council of Hong Kong [N HKU748/10]
- Ministry of Science and Technology of China [2011CB921700, 2012CB821403]
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Based on the two-dimensional pi-flux model, we study the interaction effects both in nontrivial massive and massless Dirac fermions with the numerical exact diagonalization method. In the presence of the nearest and next-nearest neighbor interactions: For a nontrivial massive Dirac fermion, the topological phase is robust and persists in a finite region of the phase diagram; while for the massless Dirac fermion, charge-density wave and stripe phases are identified and the phase diagram in the (V-1, V-2) plane is obtained. When the next-next-nearest neighbor interaction is further included to massless Dirac fermion, the topological phase expected in themean-field theory is absent. Our results are related to the possibility of dynamically generating a topological phase from the electronic correlations.
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