Figure 2
From: Quantized spin pump on helical edge states of a topological insulator
Pumped charge currents IL in the double-boundary pump device as functions of (a) the Fermi energy E, (b) the pumping phase φ, (c) the distance L0, and (d) the local potential Vg. Parameters are φ = π/2, E = 0.001t, L0 = 0, Vg = 0, and M0 = 0.01t.
