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The valley degree of freedom in two-dimensional (2D) crystals recently emerged as a novel information carrier in addition to spin and charge. The intrinsic valley lifetime in 2D transition metal

The valley degree of freedom in two-dimensional (2D) crystals recently emerged as a novel information carrier in addition to spin and charge. The intrinsic valley lifetime in 2D transition metal dichalcogenides (TMD) is expected to be markedly long due to the unique spin-valley locking behavior, where the intervalley scattering of the electron simultaneously requires a large momentum transfer to the opposite valley and a flip of the electron spin. However, the experimentally observed valley lifetime in 2D TMDs has been limited to tens of nanoseconds thus far.

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    Date Created
    • 2017-07-26
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    • Digital object identifier: 10.1126/sciadv.1700518
    • Identifier Type
      International standard serial number
      Identifier Value
      2375-2548
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    Kim, J., Jin, C., Chen, B., Cai, H., Zhao, T., Lee, P., . . . Wang, F. (2017). Observation of ultralong valley lifetime in WSe 2 /MoS 2 heterostructures. Science Advances, 3(7). doi:10.1126/sciadv.1700518

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