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Optical Manipulation of Layer–Valley Coherence via Strong Exciton–Photon Coupling in Microcavities

Khatoniar, M and Yama, N and Ghazaryan, A and Guddala, S and Ghaemi, P and Majumdar, K and Menon, V (2023) Optical Manipulation of Layer–Valley Coherence via Strong Exciton–Photon Coupling in Microcavities. In: Advanced Optical Materials .

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Official URL: https://doi.org/10.1002/adom.202202631


Coherent control and manipulation of quantum degrees of freedom such as spins forms the basis of emerging quantum technologies. In this context, the robust valley degree of freedom and the associated valley pseudospin found in two-dimensional transition metal dichalcogenides is a highly attractive platform. Valley polarization and coherent superposition of valley states have been observed in these systems even up to room temperature. Control of valley coherence is an important building block for the implementation of valley qubit. Large magnetic fields or high-power lasers have been used in the past to demonstrate the control (initialization and rotation) of the valley coherent states. Here, the control of layer–valley coherence via strong coupling of valley excitons in bilayer WS2 to microcavity photons is demonstrated by exploiting the pseudomagnetic field arising in optical cavities owing to the transverse electric–transverse magnetic (TE–TM)mode splitting. The use of photonic structures to generate pseudomagnetic fields which can be used to manipulate exciton-polaritons presents an attractive approach to control optical responses without the need for large magnets or high-intensity optical pump powers.

Item Type: Journal Article
Publication: Advanced Optical Materials
Publisher: John Wiley and Sons Inc
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Degrees of freedom (mechanics); Excitons; High power lasers; Landforms; Optical pumping; Phonons; Photons; Transition metals; Tungsten compounds, 2d material; Coherent control; Coherent manipulation; Exciton-photon coupling; Exciton-polariton; Optical manipulation; Pseudospin; Quantum technologies; Two-dimensional; Valleytronic, Microcavities
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 25 May 2023 03:35
Last Modified: 25 May 2023 03:35
URI: https://eprints.iisc.ac.in/id/eprint/81521

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