Interaction-dependent enhancement of the localisation length for two interacting particles in a one-dimensional random potential

Details Interaction-dependent enhancement of the localisation length for two interacting particles in a one-dimensional random potential Interaction-dependent enhancement of the localisation length for two interacting particles in a one-dimensional random potential

1998-06-22

arxiv.org/abs/cond-mat/9806255v1

Eur. Phys. J. B 8, 643-652 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

34 RevTeX 3.0 pages with 16 figures included

Scientific paper

10.1007/s100510050732

We present calculations of the localisation length, $\lambda_{2}$, for two interacting particles (TIP) in a one-dimensional random potential, presenting its dependence on disorder, interaction strength $U$ and system size. $\lambda_{2}(U)$ is computed by a decimation method from the decay of the Green function along the diagonal of finite samples. Infinite sample size estimates $\xi_{2}(U)$ are obtained by finite-size scaling. For U=0 we reproduce approximately the well-known dependence of the one-particle localisation length on disorder while for finite $U$, we find that $ \xi_{2}(U) \sim \xi_2(0)^{\beta(U)} $ with $\beta(U)$ varying between $\beta(0)=1$ and $\beta(1) \approx 1.5$. We test the validity of various other proposed fit functions and also study the problem of TIP in two different random potentials corresponding to interacting electron-hole pairs. As a check of our method and data, we also reproduce well-known results for the two-dimensional Anderson model without interaction.

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