Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1997-02-10
Physics
Condensed Matter
Disordered Systems and Neural Networks
1 page, Revtex, one figure
Scientific paper
10.1103/PhysRevLett.78.4889
In a recent letter [Phys. Rev. Lett. 78, 515 (1997); cond-mat/9612034] Roemer and Schreiber report on numerical calculations that led them to conclude that the previously observed enhancement of the localization length $L_2$ of two interacting particles (TIP) vanishes in the thermodynamic limit. We point out that such a claim (i) is in conflict with the scaling theory of localization, (ii) ignores a consistent picture from a wealth of published numerical data and analytical investigations, and (iii) directly contradicts new numerical results obtained with a Green function method that is well adapted to the problem under study. The claim of Roemer and Schreiber is based on extrapolating from L<360 to infinity. Our data clearly shows the two particle localization length $L_2$ to be significantly enhanced and independent of system size between L=100 and L=1000, as expected on physical grounds.
Frahm Klaus
Mueller-Groeling Axel
Pichard Jean-Louis
Weinmann Dietmar
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