Conductance through quantum dots studied by finite temperature DMRG

With the finite temperature density matrix renormalization group method (FT-DMRG), we have developed a method to calculate thermodynamic quantities and the conductance of a quantum dot system. Conductance is written by the local density of states at the dot. The density of states is calculated with the numerical analytic continuation from the thermal Green's function which is obtained directly by the FT-DMRG. Typical Kondo behaviors in the quantum dot system are investigated clearly by comparing the conductance with the magnetic and charge susceptibilities: Coulomb oscillation peaks and the unitarity limit. We also discuss the advantage and disadvantage of the present method.