Observation of electrically tunable Feshbach resonances in twisted bilayer semiconductors

Abstract

Moire superlattices in twisted transition metal dichalcogenide bilayers have emerged as a rich platform for exploring strong correlations using optical spectroscopy. Despite observation of rich Mott-Wigner physics stemming from an interplay between the periodic potential and Coulomb interactions, the absence of tunnel coupling induced hybridization of electronic states ensured a classical layer degree of freedom in these experiments. Here, we investigate a MoSe${}_2$ homobilayer structure where inter-layer coherent tunnelling and layer-selective optical transitions allow for electric field controlled manipulation and measurement of the layer-pseudospin of the ground-state holes. A striking example of qualitatively new phenomena in this system is our observation of an electrically tunable 2D Feshbach resonance in exciton-hole scattering, which allows us to control the strength of interactions between excitons and holes located in different layers. Our findings enable hitherto unexplored possibilities for optical investigation of many-body physics, as well as realization of degenerate Bose-Fermi mixtures with tunable interactions, without directly exposing the itinerant fermions to light fields.

Main text: 9 pages, 4 figures; Supplementary Material: 9 pages, 7 figures

References in corpus (6)

• Many-Body Physics with Ultracold Gases
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Polaritonic Feshbach Resonance
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Tunable Feshbach resonances and their spectral signatures in bilayer semiconductors

Cited by in corpus (32)

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• Light-induced topological superconductivity in transition metal dichalcogenide monolayers
• Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature
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• The Fate of the Upper Polariton: Breakdown of the Quasiparticle Picture in the Continuum
• Feshbach hypothesis of high-Tc superconductivity in cuprates
• Electrically tunable layer-hybridized trions in doped WSe${}_2$ bilayers
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• Exciton fractional Chern insulators in moiré heterostructures
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