In Figure 5 b, we observed a decreasing trend in tan δ as the frequency increased within the range of 10 to 10 3 Hz.
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Study on Bulk-Surface Transport Separation and Dielectric Polarization of Topological Insulator Bi<sub>1.2</sub>Sb<sub>0.8</sub>Te<sub>0.4</sub>Se<sub>2.6</sub>.
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