The photon-assisted shot noise of a strongly correlated quantum dot coupled to the Luttinger liquid leads

The joint effects of an ac field and intralead interaction on shot noise of a Kondo quantum dot coupled to Luttinger liquid leads is investigated. A general photon-assisted zero-frequency shot noise formula is derived by use of the extended equation of motion of the nonequilibrium Green function. The photon-assisted shot noise demonstrates antiresonant-like behavior. The differential shot noise versus bias voltage exhibits steps the widths of which are just the ac frequency. With the increase of the intralead interaction, the antiresonances and step-structure are gradually smoothed and eventually disappear in the limit of the strong intralead interaction. In the limit, the shot noise scales as a power law in bias voltage, a signature of strong intralead interactions. The measurements of the photon-assisted zero-frequency shot noise can provide valuable information of the intralead interaction.