Comment on ``Enhancement of the Tunneling Density of States in Tomonaga-Luttinger Liquids''

Details Comment on ``Enhancement of the Tunneling Density of States in Tomonaga-Luttinger Liquids'' Comment on ``Enhancement of the Tunneling Density of States in Tomonaga-Luttinger Liquids''

1997-02-10

arxiv.org/abs/cond-mat/9702080v1

Physics

Condensed Matter

Strongly Correlated Electrons

1 page, Revtex

Scientific paper

10.1103/PhysRevLett.78.4527

In a recent Physical Review Letter, Oreg and Finkel'stein (OF) have calculated the electron density of states (DOS) for tunneling into a repulsive Luttinger liquid close to the location of an impurity. The result of their calculation is a DOS which is enhanced with respect to the pure system, and moreover diverging for not too strong repulsion. In this Comment we intend to show that OF's calculation suffers from a subtle flaw which, being corrected, results into a DOS not only vanishing at zero frequency but in fact suppressed in comparison with the DOS of a pure Luttinger liquid.

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