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Current generated spin polarization in topological insulator (TI) surfacestates due to spin-momentum locking has been detected recently usingferromagnet/tunnel barrier contacts, where the projection of the TI spin ontothe magnetization of the ferromagnet is measured as a voltage. However,opposing signs of the spin voltage have been reported, which had beententatively attributed to the coexistence of trivial two-dimensional electrongas states on the TI surface which may exhibit opposite current-inducedpolarization than that of the TI Dirac surface states. Models based onelectrochemical potential have been presented to determine the sign of the spinvoltage expected for the TI surface states. However, these models neglectcritical experimental parameters which also affect the sign measured. Here wepresent a Mott two-spin current resistor model which takes into account theseparameters such as spin-dependent interface resistances, and show that suchinclusion can lead to a crossing of the voltage potential profiles for thespin-up and spin-down electrons within the channel, which can lead to measuredspin voltages of either sign. These findings offer a resolution of the ongoingcontroversy regarding opposite signs of spin signal reported in the literature,and highlight the importance of including realistic experimental parameters inthe model.

Electrical detection of current generated spin in topological insulator surface states: Role of interface resistance