Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators

Yang Xu, Ireneusz Miotkowski and Yong P. Chen ()
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Yang Xu: Purdue University
Ireneusz Miotkowski: Purdue University
Yong P. Chen: Purdue University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Topological insulators are a novel class of quantum matter with a gapped insulating bulk, yet gapless spin-helical Dirac fermion conducting surface states. Here, we report local and non-local electrical and magneto transport measurements in dual-gated BiSbTeSe2 thin film topological insulator devices, with conduction dominated by the spatially separated top and bottom surfaces, each hosting a single species of Dirac fermions with independent gate control over the carrier type and density. We observe many intriguing quantum transport phenomena in such a fully tunable two-species topological Dirac gas, including a zero-magnetic-field minimum conductivity close to twice the conductance quantum at the double Dirac point, a series of ambipolar two-component half-integer Dirac quantum Hall states and an electron-hole total filling factor zero state (with a zero-Hall plateau), exhibiting dissipationless (chiral) and dissipative (non-chiral) edge conduction, respectively. Such a system paves the way to explore rich physics, ranging from topological magnetoelectric effects to exciton condensation.

Date: 2016
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DOI: 10.1038/ncomms11434

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