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Re-entrant quantum Hall effect links 3D topological insulators to 2D Dirac fermions

Published on:

8 February 2024

Primary Category:

Mesoscale and Nanoscale Physics

Paper Authors:

Li-Xian Wang,

Wouter Beugeling,

Fabian Schmitt,

Lukas Lunczer,

Julian-Benedikt Mayer,

Hartmut Buhmann,

Ewelina M. Hankiewicz,

Laurens W. Molenkamp

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Key Details

Re-entrant quantum Hall effect observed in 3D topological insulator

Effect links 3D TIs to parity anomaly of 2D Dirac fermions

Requires coexistence of topological and trivial surface states

Change in Hall resistance signifies loss/gain of e2/h contribution

Effect accessible in any TI dominated by single Dirac surface

AI generated summary

Re-entrant quantum Hall effect links 3D topological insulators to 2D Dirac fermions

Researchers observe an unconventional re-entrant quantum Hall effect in a 3D topological insulator (Hg,Mn)Te that directly relates to the parity anomaly of 2D massless Dirac fermions. This spectral asymmetry effect should be observable in any topological insulator dominated by a single Dirac surface state.

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