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. 2021 Jul 23;7(30):eabh0863. doi: 10.1126/sciadv.abh0863

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 5 — (A) Valley polarization for IXs in 1L-WSe₂/4L-MoS₂ under three magnetic fields: −1, 0, and 1 T. An enhanced valley polarization under magnetic field has been observed. (B) Magnetic dependence of DOP. Valley mixing has been suppressed for all m = 1, 3, and 4 cases. (C) Time-resolved DOP for IXs in 1L-WSe₂/4L-MoS₂ at −1, 0, and 1 T (0.125-MHz repetition rate is used here). An enhanced valley polarization lifetime has been observed under magnetic field. (D) The magnetic field dependence of valley DOP lifetime under left and right circularly polarized light excitation, respectively. (E) Time-resolved photon emission at different magnetic fields. (F) The magnetic field suppressed valley relaxation characterization. The temperature for all measurements under magnetic fields is around 4.3 K.