Phase coherent transport in bilayer and trilayer MoS2

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.

arXiv comment21 pages, 7 figures

References in corpus (15)

• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Control of valley polarization in monolayer MoS2 by optical helicity
• MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Electrical Tuning of Valley Magnetic Moment via Symmetry Control
• Electrical control of the valley Hall effect in bilayer MoS2 transistors
• Gate-induced Superconductivity in atomically thin MoS2 crystals
• Magnetoelectric effects and valley controlled spin quantum gates in transition metal dichalcogenide bilayers
• Spin-Layer Locking Effects in Optical Orientation of Exciton Spin in Bilayer WSe2
• Spin-orbit coupling, quantum dots, and qubits in monolayer transition metal dichalcogenides
• Magneto-Transport in MoS2: Phase Coherence, Spin Orbit Scattering and the Hall Factor
• Charge transport in ion-gated mono-, bi-, and trilayer MoS2 field effect transistors
• Quantum transport and observation of Dyakonov-Perel spin-orbit scattering in monolayer MoS${}_2$
• Screening in gated bilayer graphene via variational calculus
• Weak localization in boron nitride encapsulated bilayer MoS${}_2$

Cited by in corpus (2)

• Atomistic $T$-matrix theory of disordered 2D materials: Bound states, spectral properties, quasiparticle scattering, and transport
• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals