Effects of in-plane magnetic fields on Coulomb oscillations of a double-quantum-dot molecule

We studied the electronic structure and the electron transport in vertically coupled double quantum dots as a function of the number of electrons and strength of the magnetic field apl,lied in the direction perpendicular to the electric current. In weakly coupled double quantum dots, the electron correlation leads to the spin blockade in the Coulomb oscillations of the conductance. To date, however, it has been difficult to observe the spin blockade clearly since the temperature is not sufficiently low. We propose an experimental method to confirm the electron correlation effects even in the present temperature regime.