研究目的
Investigating the entanglement between chiral phonons in a two-dimensional WSe2 host and single-photons emitted from quantum dots present in it.
研究成果
The study demonstrates entanglement between chiral phonons in a two-dimensional WSe2 host and single-photons emitted from quantum dots. This opens up new possibilities for phonon-driven entanglement of QDs and engineering chiral or non-reciprocal interactions at the single-photon level. The findings lay the groundwork for the realization of quantum-optomechanical platforms in van der Waals materials.
研究不足
The study relies on the degeneracy of the two σ-polarized states and the orthogonal CPs, which are protected by time-reversal symmetry. Breaking these degeneracies, especially the CP degeneracy, is challenging as phonons do not couple well to magnetic fields in non-magnetic materials such as WSe2.
1：Experimental Design and Method Selection:
The study involves polarization-resolved photoluminescence (PL) spectroscopy on a monolayer WSe2 sample in a field effect transistor device at low incidence powers. The use of QDs enhances the electron–phonon coupling due to quantum confinement effects.
2：Sample Selection and Data Sources:
Monolayer WSe2 is mechanically exfoliated from the bulk WSe2 crystal on polydimethylsiloxane (PDMS). Thin hexagonal boron nitride (hBN) flake is exfoliated on a degenerately doped Si substrate with a 285 nm SiO2 layer on top.
3：List of Experimental Equipment and Materials:
Equipment includes a closed-cycle cryostat, a piezo controller, a home-built confocal microscope set-up, a high-resolution spectrometer, a liquid nitrogen-cooled charge coupled device, a HeNe laser, and a mode-hop-free tunable continuous-wave Ti:Sapphire laser.
4：Experimental Procedures and Operational Workflow:
The sample is loaded into a cryostat and cooled down to ~3.5 K. PL spectroscopy was performed using a confocal microscope set-up. The emission was collected and directed to a spectrometer where it was dispersed by a grating and detected using a CCD.
5：5 K. PL spectroscopy was performed using a confocal microscope set-up. The emission was collected and directed to a spectrometer where it was dispersed by a grating and detected using a CCD.
Data Analysis Methods:
5. Data Analysis Methods: The polarization properties of the doublets are analyzed, and the density matrix of the photon polarization is reconstructed from the Stokes parameter extracted from the polarization measurements.
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