Long-distance decay-less spin transport in indirect excitons in a van der Waals heterostructure
arxiv(2024)
摘要
In addition to its fundamental interest, the long-distance spin transport
with suppressed spin losses is essential for spintronic devices. However, the
spin relaxation caused by scattering of the particles carrying the spin, limits
the spin transport. We explored spatially indirect excitons (IXs), also known
as interlayer excitons, in van der Waals heterostructures (HS) composed of
atomically thin layers of transition-metal dichalcogenides (TMD) as spin
carries. TMD HS also offer coupling of spin and valley transport. We observed
the long-distance spin transport with the decay distances exceeding 100 μm
and diverging so spin currents show no decay in the HS. With increasing IX
density, we observed spin localization, then long-distance spin transport, and
then reentrant spin localization, in agreement with the Bose-Hubbard theory
prediction for superfluid and insulating phases in periodic potentials due to
moiré superlattices. The suppression of scattering in exciton superfluid
suppresses the spin relaxation and enables the long-distance spin transport.
This mechanism of protection against the spin relaxation makes IXs a platform
for the realization of long-distance decay-less spin transport.
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