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• W2735753835 abstract "In single-layer WSe$_2$, a paradigmatic semiconducting transition metal dichalcogenide, a circularly polarized laser field can selectively excite electronic transitions in one of the inequivalent $K^{pm}$ valleys. Such selective valley population corresponds to a pseudospin polarization. This can be used as a degree of freedom in a valleytronic device provided that the time scale for its depolarization is sufficiently large. Yet, the mechanism behind the valley depolarization still remains heavily debated. Recent time-dependent Kerr experiments have provided an accurate way to visualize the valley dynamics by measuring the rotation of a linearly polarized probe pulse applied after a circularly polarized pump pulse. We present here a clear, accurate and parameter-free description of the valley dynamics. By using an atomistic, ab initio, approach we fully disclose the elemental mechanisms that dictate the depolarization effects. Our results are in excellent agreement with recent time-dependent Kerr experiments. We explain the Kerr dynamics and its temperature dependence in terms of electron-phonon mediated processes that induce spin-flip inter-valley transitions." @default.
• W2735753835 created "2017-07-21" @default.
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• W2735753835 date "2017-07-14" @default.
• W2735753835 modified "2023-10-13" @default.
• W2735753835 title "Ab Initio Calculations of Ultrashort Carrier Dynamics in Two-Dimensional Materials: Valley Depolarization in Single-Layer WSe₂" @default.
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• W2735753835 doi "https://doi.org/10.1021/acs.nanolett.7b00175" @default.
• W2735753835 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28692278" @default.
• W2735753835 hasPublicationYear "2017" @default.
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