Physics – Condensed Matter
Scientific paper
1996-08-26
Phys. Rev. B 53, 8828-8831 (1996)
Physics
Condensed Matter
RevTeX, 4 pages, 3 Postscript figures
Scientific paper
10.1103/PhysRevB.53.R8828
The density-matrix renormalization-group method is applied to the one-dimensional Kondo-lattice model with the Coulomb interaction between the conduction electrons. The spin and charge gaps are calculated as a function of the exchange constant $J$ and the Coulomb interaction $U_c$. It is shown that both the spin and charge gaps increase with increasing $J$ and $U_c$. The spin gap vanishes in the limit of $J \rightarrow 0$ for any $U_c$ with an exponential form, $\Delta_s\propto \exp{[-1/\alpha (U_c) J \rho]}$. The exponent, $\alpha (U_c)$, is determined as a function of $U_c$. The charge gap is generally much larger than the spin gap. In the limit of $J \rightarrow 0$, the charge gap vanishes as $\Delta_c=\frac{1}{2}J$ for $U_c=0$ but for a finite $U_c$ it tends to a finite value, which is the charge gap of the Hubbard model.
Ishii Chikara
Nishino Tomotoshi
Shibata Naokazu
Ueda Kazushi
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