Shallow donor in natural MoS2 |
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| Authors: | Nguyen T Son Yong‐Sung Kim Erik Janzén |
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| Institution: | 1. Department of Physics, Chemistry and Biology, Link?ping University, Link?ping, Sweden;2. Korea Research Institute of Standards and Science, Yuseong, Daejeon, Korea;3. Department of Nano Science, Korea University of Science and Technology, Daejeon, Korea |
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| Abstract: | Using electron paramagnetic resonance and density functional theory calculations, we show that the shallow donor responsible for the n‐type conductivity in natural MoS2 is rhenium (Re) with a typical concentration in the low 1017 cm–3 range and the g ‐values: g|| = 2.0274 and g⊥ = 2.2642. In bulk MoS2, the valley–orbit (VO) splitting and ionization energy of the Re shallow donor are determined to be ～3 meV and ～27 meV, respectively. Calculations show that the VO splitting of Re approaches the value in bulk if the number of MoS2 layers is larger than four and increases to 97.9 meV in a monolayer. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim) |
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| Keywords: | MoS2 rhenium shallow donors valley− orbit splitting electron paramagnetic resonance density functional theory |
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