Long-range spin transport in a system of indirect excitons in van der Waals MoSe<sub>2</sub> /WSe<sub>2</sub> heterostructure
ORAL
Abstract
Excitons in 2D van der Waals transition-metal dichalcogenide (TMD) heterostructures are characterized by high binding energies and determine optical properties of TMD heterostructures. Spatially indirect excitons (IXs), also known as interlayer excitons, are composed of electrons and holes in separated layers. TMD heterostructures are characterized by strong moiré superlattice potentials for IXs [1,2]. The long IX lifetimes make possible IX transport over long distances. In this contribution, we present the observation of a long-range spin transport in a system of IXs in MoSe2 /WSe2 heterostructure. The spin transport decay distance reaches and exceeds 100 microns. We measured the range of parameters, including the exciton density and temperature, of the long-range spin transport.
*The measurements of spin transport were supported by DOE Office of Basic Energy Sciences under Award No. DE-FG02-07ER46449. The heterostructure fabrication was supported by NSF Grant No. 1905478.
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Publication: [1] F. Wu et al. PRL 118, 147401 (2017).
[2] H. Yu et al. Sci. Adv. 3, e1701696 (2017).
Presenters
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Zhiwen Zhou
- UC San Diego