We study theoretically the transport through a single impurity in a one-channel Luttinger liquid coupled to a dissipative (ohmic) bath . For non-zero dissipation $\eta$ the weak link is always a relevant perturbation which suppresses transport strongly. At zero temperature the current voltage relation of the link is $I\sim \exp(-E_0/eV)$ where $E_0\sim\eta/\kappa$ and $\kappa$ denotes the compressibility. At non-zero temperature $T$ the linear conductance is proportional to $\exp(-\sqrt{ { \cal C}E_0/k_BT})$. The decay of Friedel oscillation saturates for distance larger than $L_{ \eta}\sim 1/\eta $ from the impurity.
Categories: cond-mat.mes-hall cond-mat.str-el