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Layer-dependent correlated phases in WSe2/MoS2 moiré superlattice
Qinghai Tan1,2, Abdullah Rasmita1, Zhaowei Zhang1
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
Nature Materials
|April 17, 2023
Summary
Researchers electrically controlled interlayer interactions in WSe2/MoS2 moiré heterostructures. This revealed layer-dependent correlated phases influencing interlayer exciton dynamics, offering new insights into quantum phenomena.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Electron correlation is crucial for quantum phenomena in moiré heterostructures.
- Interactions between distinct layers in heterostructures present novel research avenues.
Purpose of the Study:
- To investigate electrical control of interlayer interactions in WSe2/MoS2 heterobilayers.
- To explore the resulting layer-dependent correlated phases and their effect on interlayer excitons.
Main Methods:
- Utilized interlayer excitons as a probe.
- Investigated heterobilayers of tungsten diselenide and molybdenum disulfide (WSe2/MoS2).
- Employed electrical switching to control interlayer interactions.
Main Results:
- Demonstrated electrical switching of interlayer interactions, enabling on/off control.
- Revealed a layer-dependent correlated phase diagram, including single-layer, layer-selective, excitonic-insulator, and layer-hybridized regions.
- Showed that these correlated phases impact interlayer exciton non-radiative decay pathways.
Conclusions:
- Strong electron correlation significantly influences interlayer exciton dynamics in moiré heterostructures.
- The findings pave the way for studying layer-resolved strong correlation behaviors in moiré systems.
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