Figure 1

Sketches of the spin diode system and electrostatic model. (a) Sketch of the spin diode system. The dot level is attached to two ferromagnetic contacts. V _{L σ} and V _{R σ} indicate the spin-dependent bias voltages applied to the left (L) and (R) right contacts, respectively. The dot level is spin split by a magnetic field B: ε _↑ ≠ε _↓ . Both spin-dependent energy levels are connected by spin-flip processes with a rate given by γ_sf. (b) Electrostatic model: ϕ _↑ , and ϕ _↓ are the dot internal potentials calculated using capacitance couplings [ C _{u i} , C _{d i} (i=1⋯4), C] within an electrostatic model.