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

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 BiSbTeSe 2 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. As a result, such a system paves the way to explore rich physics, ranging from topological magnetoelectric effects to exciton condensation.

Authors:
 [1];  [1];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1258467
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Xu, Yang, Miotkowski, Ireneusz, and Chen, Yong P. Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators. United States: N. p., 2016. Web. doi:10.1038/ncomms11434.
Xu, Yang, Miotkowski, Ireneusz, & Chen, Yong P. Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators. United States. doi:10.1038/ncomms11434.
Xu, Yang, Miotkowski, Ireneusz, and Chen, Yong P. Wed . "Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators". United States. doi:10.1038/ncomms11434. https://www.osti.gov/servlets/purl/1258467.
@article{osti_1258467,
title = {Quantum transport of two-species Dirac fermions in dual-gated three-dimensional topological insulators},
author = {Xu, Yang and Miotkowski, Ireneusz and Chen, Yong P.},
abstractNote = {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. As a result, such a system paves the way to explore rich physics, ranging from topological magnetoelectric effects to exciton condensation.},
doi = {10.1038/ncomms11434},
journal = {Nature Communications},
issn = {2041-1723},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {5}
}

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Cited by: 11 works
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    Works referencing / citing this record:

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