Dynamical properties of quantum ring under the stepped pulse bias
阶梯电压下量子环的动力学性质

The dynamical properties of a one-dimensional quantum ring with a constant magnetic flux are studied using the non-equilibrium Green's function method. The ring is coupled through a single lead to an electron reservoir,which is driven by a stepped pulse bias. We provide a numerical method to calculate current in the presence of stepped bias. Our results reveal the relation between the evolution of tunneling current and electron energy levels of the ring.