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Pure spin currents are shown to be generated by an electrically controlledquantum pump applied at the edges of a topological insulator. The electricrather than the more conventional magnetic control offers several advantagesand avoids, in particular, the necessity of delicate control of magnetizationdynamics over tiny regions. The pump is implemented by pinching the sample attwo quantum point contacts and phase modulating two external gate voltagesbetween them. The spin current is generated for the full range of parameters.On the other hand, pumping via amplitude modulation of the inter-boundarycouplings generates both charge and spin currents, with a pure charge currentappearing only for special values of the parameters for which the Bohm-Aharonovflux takes integer values. Our setup can therefore serve to fingerprint thehelical nature of the edges states with the zeros of the pumped spin and chargecurrents occurring at distinct universal locations where the Fabry-Perot or theAharonov-Bohm phases take integer values.

Electrically Controlled Pumping of Spin Currents in Topological Insulators