Journal
PHYSICAL REVIEW B
Volume 101, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.201405
Keywords
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Funding
- National Science Foundation (NSF) [DMR-1809680, DMR-1608437]
- Center for Precision Assembly of Superstratic and Superatomic Solids, a Materials Science and Engineering Research Center (MRSEC) through NSF [DMR-1420634]
- Columbia Nano Initiative Office of Naval Research Grant [N00014-18-1-2080]
- Vannevar Bush Faculty Fellowship through Office of Naval Research Grant [N00014-18-1-2080]
- Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) Postdoctoral Research Award under the EERE Solar Energy Technologies Office
- Oak Ridge Associated Universities (ORAU) under DOE Contract [DE-SC00014664]
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Photoinduced charge separation in transition-metal dichalcogenide heterobilayers is being explored for moire excitons, spin-valley polarization, and quantum phases of excitons/electrons. While different momentum points can be critically involved in charge separation dynamics, little is known directly from experiments. Here we determine momentum-resolved electron dynamics in the WS2/MoS2 heterobilayer using time- and angle-resolved photoemission spectroscopy. Upon photoexcitation in the K valleys, we detect electrons in M/2, M, and Q valleys/points on timescales as short as similar to 70 fs, followed by dynamic equilibration in K and Q valleys in similar to 400 fs. These findings reveal the essential role of phonon scattering, the coexistence of direct and indirect interlayer excitons, and constraints on spin-valley polarization.
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