Electrical Initialization and Readout of Triplet Spins

Research into new classes of organic materials has revealed promising quantum phenomena, which yield unique advantages for spintronic, quantum sensing, and quantum computing fields. We present work on devices that incorporate two relatively new organic spin phenomena, namely singlet fission (SF) and chirality induced spin selectivity (CISS), as a room temperature initialization and readout mechanism of triplet spins. Promising gate operations and coherence times have already been demonstrated with triplet exciton spin transfer using optical techniques, but a key challenge is the ability to address individual molecular spins. Polycrystalline pentacene is chosen as the active layer, as the high carrier mobility and highly efficient SF produces spin-spin interactions that are electrically detectable under an applied magnetic field. (PEA)₂PbI₄ perovskite acts as the CISS layer, injecting only spin polarized carriers, eventually purifying the triplet complexes to essentially initialize in a direction parallel with the applied field. Using a complete quantum kinetic model and orientation dependent magnetoresistance as the detection mechanism, these devices provide promising first steps in the room temperature initialization and readout of molecular triplet spins.