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New excitons in multilayer 2D materials - Nature Reviews Physics
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Excitonic effects dominate the optical properties of 2D materials, and excitons have been observed both within a single layer, and between two layers of 2D materials. In 2023, a number of experiments on trilayer 2D structures uncovered new exciton states — quadrupolar and every-other-layer excitons — that have an electrically-tunable dipole moment and show a quantum many-body phase diagram.
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