This PDF file includes:

• note S1. More discussions on the possible mechanisms for the persistent spin polarization, dynamical spin polarization between TSS electrons and nuclear spins, and the interplay of the SML of TSS electrons and hyperfine interaction between the TSS electron spins and nuclear spins.
  
• fig. S1. Characterization of the magnetic (Py) electrodes.
  
• fig. S2. Complete data set on the current dependence of the measured spin signal in device A.
  
• fig. S3. Spin signal largely independent on I_d measured in additional devices.
  
• fig. S4. The writing current effect on the spin signal during cooling.
  
• fig. S5. The writing current effect on the spin signal measured at 26 K.
  
• fig. S6. Effect of the magnitude of writing current I_w on the spin signal.
  
• fig. S7. Effect of current writing time on the spin signal.
  
• fig. S8. Temperature dependence of the measured spin signal.
  
• table S1. Lifetime of the NSP reported in different systems from previous literature.
  
• References (53–68)

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