Two-Level Quantum Systems in Two-Dimensional Materials for Single Photon Emission.
basic_science · Level V
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- Record sourced from PubMed, PMID 30532982.
- Also identified by DOI 10.1021/acs.nanolett.8b04159.
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Abstract
Single photon emission (SPE) by a solid-state source requires presence of a distinct two-level quantum system, usually provided by point defects. Here we note that a number of qualities offered by novel, two-dimensional materials, their all-surface openness and optical transparence, tighter quantum confinement, and reduced charge screening-are advantageous for achieving an ideal SPE. On the basis of first-principles calculations and point-group symmetry analysis, a strategy is proposed to design paramagnetic defect complex with reduced symmetry, meeting all the requirements for SPE: its electronic states are well isolated from the host material bands, belong to a majority spin eigenstate, and can be controllably excited by polarized light. The defect complex is thermodynamically stable and appears feasible for experimental realization to serve as an SPE-source, essential for quantum computing, with Re<sub>Mo</sub>V<sub>S</sub> in MoS<sub>2</sub> as one of the most practical candidates.