Anomalously robust valley polarization and valley coherence in bilayer WS2
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AbstractWe report the observation of anomalously robust valley polarization and valley coherence in bilayer WS2. The polarization of the photoluminescence from bilayer WS2 follows that of the excitation source with both circular and linear polarization, and remains even at room temperature. The near-unity circular polarization of the luminescence reveals the coupling of spin, layer, and valley degree of freedom in bilayer system, and the linearly polarized photoluminescence manifests quantum coherence between the two in-equivalent band extrema in momentum space, namely, the valley quantum coherence in atomically thin bilayer WS2. This observation provides insight into quantum manipulation in atomically thin semiconductors.
All Author(s) ListZhu BR, Zeng HL, Dai JF, Gong ZR, Cui XD
Journal nameProceedings of the National Academy of Sciences
Volume Number111
Issue Number32
Pages11606 - 11611
LanguagesEnglish-United Kingdom
Keywordsspin-valley coupling; valley quantum control; valleytronics
Web of Science Subject CategoriesMultidisciplinary Sciences; MULTIDISCIPLINARY SCIENCES; Science & Technology - Other Topics

Last updated on 2020-06-08 at 04:27