Enhancement of tunneling density of states at a junction of three Luttinger liquid wires

Amit Agarwal, Sourin Das, Sumathi Rao, Diptiman Sen

Published 2008-10-20, updated 2009-07-31Version 4

We study the tunneling density of states (TDOS) for a junction of three Tomonaga-Luttinger liquid wires. We show that there are fixed points which allow for the enhancement of the TDOS, which is unusual for Luttinger liquids. The distance from the junction over which this enhancement occurs is of the order of x = v/(2 \omega), where v is the plasmon velocity and \omega is the bias frequency. Beyond this distance, the TDOS crosses over to the standard bulk value independent of the fixed point describing the junction. This finite range of distances opens up the possibility of experimentally probing the enhancement in each wire individually.