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Spin-layer locking of interlayer excitons trapped in moiré potentials.

Mauro Brotons-Gisbert1, Hyeonjun Baek2, Alejandro Molina-Sánchez3,4

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Researchers observed spin-layer locking of interlayer excitons (IXs) in twisted transition metal dichalcogenide (TMD) heterostructures. This finding enables the engineering of quantum systems using the layer index as a tunable degree of freedom.

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Area of Science:

  • Quantum Materials Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • Van der Waals heterostructures enable the design of novel quantum materials.
  • Transition metal dichalcogenides (TMDs) offer spin, valley, and layer degrees of freedom.
  • Twisted TMD heterobilayers create moiré patterns, modulating electronic band structure and confining interlayer excitons (IXs).

Purpose of the Study:

  • To investigate spin-layer locking of IXs in moiré potentials within a specific TMD heterostructure.
  • To explore the potential of layer index as a tunable parameter for quantum systems.

Main Methods:

  • Fabrication of a heterostructure comprising bilayer 2H-MoSe2 and monolayer WSe2.
  • Utilizing moiré patterns formed by twisted TMD layers.
  • Observing and analyzing the behavior of interlayer excitons (IXs) trapped in moiré potentials.

Main Results:

  • Observation of spin-layer locking of IXs trapped in moiré potentials.
  • Identification of two quantum-confined IX species with distinct spin-layer-valley configurations due to locked electron spin and layer index.
  • Demonstration of intrinsically locked atomic registries in the three layers of the heterostructure.

Conclusions:

  • Spin-layer locking of IXs is a viable phenomenon in twisted TMD heterostructures.
  • The layer index can be effectively utilized as a degree of freedom to engineer tunable few-level quantum systems.
  • The 2H-type stacking in bilayer TMDs plays a crucial role in locking atomic registries.