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arXiv · 1904.08597

Phase coherent transport in bilayer and trilayer MoS2

Leiqiang Chu·Indra Yudhistira·Hennrik Schmidt·Tsz Chun Wu·Shaffique Adam·Goki Eda
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Abstract

Bilayer MoS2 is a centrosymmetric semiconductor with degenerate spin states in the six valleys at the corners of the Brillouin zone. It has been proposed that breaking of this inversion symmetry by an out-of-plane electric field breaks this degeneracy, allowing for spin and valley lifetimes to be manipulated electrically in bilayer MoS2 with an electric field. In this work, we report phase-coherent transport properties of double-gated mono-, bi-, and tri-layer MoS2. We observe a similar crossover from weak localization to weak anti-localization, from which we extract the spin relaxation time as a function of both electric field and temperature. We find that the spin relaxation time is inversely proportional to momentum relaxation time, indicating that D'yakonov-Perel mechanism is dominant in all devices despite its centrosymmetry. Further, we found no evidence of electric-field induced changes in spin-orbit coupling strength. This suggests that the interlayer coupling is sufficiently weak and that electron-doped dichalcogenide multilayers behave electrically as decoupled monolayers.

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Leiqiang Chu, Indra Yudhistira, Hennrik Schmidt, Tsz Chun Wu, Shaffique Adam, Goki Eda. 2019-04-18. Phase coherent transport in bilayer and trilayer MoS2. https://doi.org/10.1103/physrevb.100.125410

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