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Electrically tunable quantum confinement of neutral excitons
Deepankur Thureja1,2, Atac Imamoglu3, Tomasz Smoleński1
1Institute for Quantum Electronics, ETH Zurich, Zurich, Switzerland.
Nature
|May 25, 2022
Summary
Researchers achieved electrical control over quantum confinement of excitons in 2D semiconductors, enabling precise manipulation of light-matter interactions for quantum technologies.
Area of Science:
- Solid-state photonics
- Quantum optics
- 2D materials
Background:
- Quantum confinement is crucial for discretizing particle motion, observed in various quantum systems.
- Existing exciton confinement methods in solid-state photonics lack precise control, hindering scalable quantum systems.
Purpose of the Study:
- To demonstrate electrically controlled quantum confinement of neutral excitons in 2D semiconductors.
- To overcome limitations of material modulation for exciton trapping potentials.
Main Methods:
- Utilized gate-defined in-plane electric fields in a lateral p-i-n junction.
- Leveraged interactions between excitons and free charges for confinement.
Main Results:
- Achieved exciton confinement below 10 nm.
- Observed quantized excitonic motion as discrete voltage-dependent optical states.
- Demonstrated strong modification of exciton wave functions by confining potentials.
Conclusions:
- Developed a technique for electrical quantum confinement of excitons in 2D materials.
- Opens pathways for scalable arrays of single-photon sources.
- Enables advancements in strongly correlated photonic phases and on-chip quantum information processing.
