Chemically modulated Hubbard ring in a magnetic field
نویسنده
چکیده
We have studied a Hubbard ring with a chemical modulation in the site potential for the half-filled band in presence of a magnetic flux. Using a mean-field approach we have calculated the conductivity and persistent current in such a ring for zero temperature. In presence of the modulation in the site energy an appreciable variation in the conductance is observed with the change in flux apart from the usual oscillations. This scenario gets substantially modified in presence of Hubbard correlation. Interplay of band-splitting effects of the chemical modulation and the electronic correlation in presence of the polarizing field gives rise to an interesting effect in the conductivity and the current.
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Half-filled Hubbard ring with alternating site potentials in a magnetic field
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