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Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

Abstract : Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice, we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field strength. This is achieved by utilizing an adaptable setup in a geometry that is compatible with the pseudo-Landau levels at all field strengths. The adopted approach enables us to observe fully formed flat-band pseudo-Landau levels spectrally as sharp peaks in the photonic density of states, and image the associated wavefunctions spatially, where we provide clear evidence for a characteristic nodal structure reflecting the previously elusive supersymmetry in the underlying low-energy theory. In particular, we resolve the full sublattice polarization of the anomalous 0th pseudo-Landau level, which reveals a deep connection to zigzag edge states in the unstrained case.
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https://hal.archives-ouvertes.fr/hal-02940060
Contributor : Ulrich Kuhl <>
Submitted on : Monday, November 23, 2020 - 9:09:57 PM
Last modification on : Monday, November 30, 2020 - 1:31:57 PM

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Matthieu Bellec, Charles Poli, Ulrich Kuhl, Fabrice Mortessagne, Henning Schomerus. Observation of supersymmetric pseudo-Landau levels in strained microwave graphene. Light: Science and Applications, Nature Publishing Group, 2020, 9 (1), ⟨10.1038/s41377-020-00351-2⟩. ⟨hal-02940060⟩

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