期刊
PHYSICAL REVIEW LETTERS
卷 117, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.187401
关键词
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资金
- European Research Council [306719]
- Agence National de la Recherche Project MoS2ValleyControl
- Institut Universitaire de France
- NEXT [ANR-10-LABX-0037]
- National Science Foundation of China [11574357]
- National Basic Research Program of China [2015CB921001]
- National Key Research Program of China [2016YFA0300601]
The direct gap interband transitions in transition metal dichalcogenide monolayers are governed by chiral optical selection rules. Determined by laser helicity, optical transitions in either the K+ or K- valley in momentum space are induced. Linearly polarized laser excitation prepares a coherent superposition of valley states. Here, we demonstrate the control of the exciton valley coherence in monolayer WSe2 by tuning the applied magnetic field perpendicular to the monolayer plane. We show rotation of this coherent superposition of valley states by angles as large as 30 degrees in applied fields up to 9 T. This exciton valley coherence control on the ps time scale could be an important step towards complete control of qubits based on the valley degree of freedom.
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