Magnetic polarization currents in double quantum dot system

Full text: We investigate coherent electron transport through two parallel single-level quantum dots. Electrons tunneling via each dot from the left lead interfere with each other at the right lead. It is shown that due to the quantum interference of tunneling electrons the double quantum dot device is magnetically polarized by coherent circulation of the hole on the closed path through the dots and the leads. Manipulating each dot energy level position, the characteristic magnetic states of the devices are adjustable as up-,non-,and down-polarization. Effects of temperature and applied bias on the magnetic polarization currents are also discussed