Pauli blockade microscopy of quantum dots.

Abstract We propose a spin-sensitive scanning probe microscopy experiment on double quantum dots in Pauli blockade conditions. Electric spin resonance is induced by an AC voltage applied to the scanning gate which causes lifting of the Pauli blockade of the current. The stationary Hamiltonian eigenstates are used as a basis for description of the spin dynamics with the AC potential of the probe. For the two-electron system we evaluate the transition rates from triplet T + state to singlet S or triplet T 0 states, i.e. to conditions in which the Pauli blockade of the current is lifted. The rates of the spin-flip transitions are consistent with the transition matrix elements and strongly dependent on the tip position. Probing the spin densities and identification of the final transition state are discussed. Highlights • The numerical description of the spin transitions in double quantum dot is presented. • The AC potential of the AFM tip causes lifting of the Pauli blockade. • The spin-transition rate strongly depends on the position of the tip. • Probing of the spatial distribution for the confined wave functions is discussed. [ABSTRACT FROM AUTHOR]