Figure 3
From: Pauli Spin Blockade in a Highly Tunable Silicon Double Quantum Dot
Pauli spin blockade in the weakly coupled regime.
Current ISD as a function of VP1 and VP2 for B = 0 T. The lead and barrier gate voltages were fixed at VL1 = VL2 = 3.2 V, VB1 = 0.656 V, VB2 = 1.176 V and VB3 = 0.940 V throughout the experiment. (a) For VSD = +2.5 mV, the ground state and excited states of a full bias triangle are shown. The current flows freely at the S(0,2)–S(1,1) transition as illustrated in the box marked by red dot. (b) The same configuration at VSD = −2.5 mV, the current between the singlet and triplet states is fully suppressed by spin blockade (green star box) except on the bottom of the bias triangle marked by the blue cross. The blue cross marks the region of leakage current in the Pauli spin blockade region due to spin-flip cotunneling [see Fig. 5(d)].
