Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 111, Issue 32, Pages 11606-11611Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1406960111
Keywords
valleytronics; spin-valley coupling; valley quantum control
Categories
Funding
- Direct Grant for Research in Chinese University of Hong Kong [P/4053082]
- National Natural Science Foundation of China [11204184]
- Area of Excellency [AoE/P-04/08]
- University of Hong Kong (HKU) Strategic Research Themes (SRT) on New Materials
- Hong Kong Research Grant Council [HKU9/CRF/13G]
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We 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.
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