4.8 Article

Electrically tunable Feshbach resonances in twisted bilayer semiconductors

期刊

SCIENCE
卷 374, 期 6565, 页码 336-+

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abj3831

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资金

  1. Swiss National Science Foundation (SNSF) [200021-178909/1]
  2. Japan Society for the Promotion of Science (JSPS)
  3. A3 Foresight by JSPS
  4. CREST [JPMJCR15F3]
  5. JST
  6. MEXT, Japan
  7. Swiss National Science Foundation (SNF) [200021_178909] Funding Source: Swiss National Science Foundation (SNF)

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In this study, Moire superlattices in transition metal dichalcogenide bilayers were used as a platform to explore strong correlations with optical spectroscopy. By investigating a MoSe2 homobilayer structure, the researchers demonstrated electric field-controlled manipulation of the ground-state hole-layer pseudospin, as well as the observation of an electrically tunable two-dimensional Feshbach resonance in exciton-hole scattering. These findings may pave the way for the realization of degenerate Bose-Fermi mixtures with tunable interactions.
Moire superlattices in transition metal dichalcogenide bilayers provide a platform for exploring strong correlations with optical spectroscopy. Despite the 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 has ensured a classical layer degree of freedom. We investigated a MoSe2 homobilayer structure where interlayer coherent tunneling allows for electric field-controlled manipulation and measurement of the ground-state hole-layer pseudospin. We observed an electrically tunable two-dimensional Feshbach resonance in exciton-hole scattering, which allowed us to control the strength of interactions between excitons and holes located in different layers. Our results may enable the realization of degenerate Bose-Fermi mixtures with tunable interactions.

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