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Coherent potential approximation study of the Mott transition in optical lattice system with site-dependent interactions |
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| Authors: | |
| Institution: | 1.Faculty of Physics,HNUE,Hanoi,Vietnam;2.Quang Ninh Teacher Training College, Nam Khe, Uong Bi,Quang Ninh,Viet Nam;3.Institute of Physics,VAST,Hanoi,Vietnam |
| Abstract: | We study the Mott transition in the half-filled Hubbard model with spatially alternating interactions by means of the coherent potential approximation. The phase boundary between metallic and insulating phases at zero temperature is derived and the nature of the Mott states is also considered. Our results are in good agreement with the ones recently obtained by the two-site dynamical mean-field theory. |
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