Breakdown of topological protection by cavity vacuum fields in the integer quantum Hall effect
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Date
2022-03-04
Publication Type
Journal Article
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Abstract
The prospect of controlling the electronic properties of materials via the vacuum fields of cavity electromagnetic resonators is emerging as one of the frontiers of condensed matter physics. We found that the enhancement of vacuum field fluctuations in subwavelength split-ring resonators strongly affects one of the most paradigmatic quantum protectorates, the quantum Hall electron transport in high-mobility two-dimensional electron gases. The observed breakdown of the topological protection of the integer quantum Hall effect is interpreted in terms of a long-range cavity-mediated electron hopping where the anti-resonant terms of the light-matter coupling Hamiltonian develop into a finite resistivity induced by the vacuum fluctuations. Our experimental platform can be used for any two-dimensional material and provides a route to manipulate electron phases in matter by means of vacuum-field engineering.
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published
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375 (6584)
Pages / Article No.
1030 - 1034
Publisher
AAAS
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03833 - Wegscheider, Werner / Wegscheider, Werner
03759 - Faist, Jérôme / Faist, Jérôme
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
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Funding
192330 - Engineering and probing Landau polaritons in the ultra-strong light-matter coupling regime (SNF)
340975 - Quantum Metamaterials in the Ultra Strong Coupling Regime. (EC)
340975 - Quantum Metamaterials in the Ultra Strong Coupling Regime. (EC)
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