Abstract
Nonmagnetic disorder in a topological insulator (TI) often dopes the material with extra electrical charges, creating a normal electron fluid coexisting with the exotic Dirac electron fluid. As both of these fluids conduct electricity, conventional transport measurements are not convenient for studying the Dirac electron fluid. Therefore the authors develop a technique in which a TI with disorder (here Bi${}_{2}$Se${}_{3}$ with Se vacancies) is used to inductively couple two coils. With this setup they are not only able to specifically identify the contribution from currents induced in the Dirac fluid, but also unravel a complex, temperature-dependent interplay between the two electron fluids.
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