Coulomb-correlated states of moiré excitons and elementary charges on a semiconductor moiré lattice at integer and fractional fillings

Polovnikov, Borislav; Scherzer, Johannes; Misra, Subhradeep; Huang, Xin; Mohl, Christian; Li, Zhijie; Göser, Jonas; Förste, Jonathan; Bilgin, Ismail; Watanabe, Kenji; Taniguchi, Takashi; Baimuratov, Anvar S.; Högele, Alexander

doi:10.48550/arxiv.2208.04056

Cited by 2 publications

(2 citation statements)

References 45 publications

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“…The reflection spectrum as a function of electron density in Fig. 1b shows several resonances close to the energy of the optical transitions in monolayer MoSe 2 , consistent with previous reports 32,33 . Intensity maxima and cusps in the resonance energies appear at equally spaced gate voltages (see Extended Data Fig.…”

Section: Doping-dependent Spectrum Of Mose 2 /Wssupporting

confidence: 90%

Kinetic magnetism in triangular moiré materials

Ciorciaro,

Smoleński,

Morera

et al. 2023

Nature

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Magnetic properties of materials ranging from conventional ferromagnetic metals to strongly correlated materials such as cuprates originate from Coulomb exchange interactions. The existence of alternate mechanisms for magnetism that could naturally facilitate electrical control has been discussed theoretically1–7, but an experimental demonstration8 in an extended system has been missing. Here we investigate MoSe2/WS2 van der Waals heterostructures in the vicinity of Mott insulator states of electrons forming a frustrated triangular lattice and observe direct evidence of magnetic correlations originating from a kinetic mechanism. By directly measuring electronic magnetization through the strength of the polarization-selective attractive polaron resonance9,10, we find that when the Mott state is electron-doped, the system exhibits ferromagnetic correlations in agreement with the Nagaoka mechanism.

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Section: Doping-dependent Spectrum Of Mose 2 /Wssupporting

confidence: 90%

Kinetic magnetism in triangular moiré materials

Ciorciaro,

Smoleński,

Morera

et al. 2023

Nature

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“…For instance, the umklapp peak was used to reveal the onset of charge incompressibility of correlated electrons in moiré bilayers [59], even without the breaking of the discrete translational symmetry. The optical signatures of generalized trions in a moiré system displaying charge density waves at fractional filling were very recently reported in [60].…”

Section: Charge Density Wavesmentioning

confidence: 88%

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

Amelio,

Goldman

2024

SciPost Phys.

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Immersing a mobile impurity into a many-body quantum system represents a theoretically intriguing and experimentally effective way of probing its properties. In this work, we study the polaron spectral function in various environments, within the framework of Fermi-Hubbard models. Inspired by possible realizations in cold atoms and semiconductor heterostructures, we consider different configurations for the background Fermi gas, including charge density waves, multiple Fermi seas and pair superfluids. While our calculations are performed using an exact-diagonalization approach, hence limiting our analysis to systems of few interacting Fermi particles, we identify robust spectral features supported by theoretical results. Our work provides a benchmark for computations based on mean-field approaches and reveal surprising features of polaron spectra, inspiring new theoretical investigations.

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Coulomb-correlated states of moiré excitons and elementary charges on a semiconductor moiré lattice at integer and fractional fillings

Cited by 2 publications

References 45 publications

Kinetic magnetism in triangular moiré materials

Kinetic magnetism in triangular moiré materials

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

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