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. 2015 Jun 29;112(28):E3645–E3650. doi: 10.1073/pnas.1502330112

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Fig. S9. — Magneto-transport study of (Bi,Sb)₂Te₃. (A) SdH oscillations of the longitudinal resistance R_xx at high magnetic field. (B) QHE of the 4QL (Bi_0.57Sb_0.43)₂Te₃ thin film_. The Hall conductivity (σ_xy) of the films measured at 0.3 K shows plateaus at the quantized values. (Inset) Hall resistance R_xy, together with the longitudinal resistance R_xx. (C and D) Electrical detection of the spin-polarized surface state conduction in (Bi,Sb)₂Te₃ samples. The measured four-probe resistance as the in-plane magnetic field is swept back and forth under dc bias of I_dc = +2 μA and I_dc = −2 μA, respectively. The red and black arrows indicate the magnetic field sweeping direction. (Insets) High-resistance state (HRS) and low-resistance state (LRS), determined by the relative orientation between the Co magnetization and the spin polarization of surface states. See ref. 55.