Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2

Abstract

Atomically thin transition metal dichalcogenides (TMDs) possess coupling of spin and valley degrees of freedom, making them promising for spin-valleytronics. ln monolayer TMDs, the emission helicity is locked to the valleys as a consequence of spin-orbit coupling and inversion symmetry breaking, leading to a valley analog of Zeeman effect in presence of out-of-plane magnetic field. As inversion symmetry is recovered in bilayers, the emission helicity should no longer be locked to the valleys. Here we show that Zeeman splitting, however, still persists in bilayers, as a result of an additional degree of freedom viz., the layer pseudospin and spin-valley-layer locking. In contrast to monolayer, Zeeman splitting here exists without lifting valley degeneracy. The degree of circularly polarized photoluminescence can be tuned with magnetic field from $-27\%$ to $27\%$. Our results demonstrate the control of degree of freedom in bilayer with magnetic field, which, together with previous electric field control, makes bilayer a promising platform for spin-valley quantum gates based on magnetoelectric effects.

arXiv comment18 pages, 9 figures

References in corpus (28)

• Van der Waals heterostructures
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Control of valley polarization in monolayer MoS2 by optical helicity
• Valley polarization in MoS2 monolayers by optical pumping
• MoS_2 as an ideal material for valleytronics: valley-selective circular dichroism and valley Hall effect
• Valley contrasting physics in graphene: magnetic moment and topological transport
• The Valley Hall Effect in MoS2 Transistors
• Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• Electrical Tuning of Valley Magnetic Moment via Symmetry Control
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Electrical control of the valley Hall effect in bilayer MoS2 transistors
• Indirect-to-direct band-gap crossover in few-layer MoTe${}_2$
• Magnetoelectric effects and valley controlled spin quantum gates in transition metal dichalcogenide bilayers
• Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
• Spin-Layer Locking Effects in Optical Orientation of Exciton Spin in Bilayer WSe2
• Direct observation of spin-polarised bulk bands in an inversion-symmetric semiconductor
• Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS${}_2$ and MoS${}_2$ to 65 Tesla
• Anomalously Robust Valley Polarization and Valley Coherence in Bilayer WS2
• Ultrafast Manipulation of Valley Pseudospin
• Control of Exciton Valley Coherence in Transition Metal Dichalcogenide Monolayers
• Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers
• Magneto-optics in transition metal diselenide monolayers
• Excitonic properties of semiconducting monolayer and bilayer MoTe2
• Direct versus indirect band gap emission and exciton-exciton annihilation in atomically thin molybdenum ditelluride (MoTe${}_2$)
• Temperature dependence of the electron spin g factor in GaAs

Cited by in corpus (20)

• Valley-dependent properties of monolayer MoSi${}_2$N${}_4$, WSi${}_2$N${}_4$ and MoSi${}_2$As${}_4$
• Predictable gate-field control of spin in altermagnets with spin-layer coupling
• Valley-Layer Coupling: A New Design Principle for Valleytronics
• Momentum-Dark Intervalley Exciton in Monolayer Tungsten Diselenide Brightened via Chiral Phonon
• Direct Observation of Gate Tunable Dark Trions in Monolayer WSe2
• Exciton states in monolayer MoSe2 and MoTe2 probed by upconversion spectroscopy
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Strain-induced valley polarization, topological states, and piezomagnetism in two-dimensional altermagnetic V${}_2$Te${}_2$O, V${}_2$STeO, V${}_2$SSeO, and V${}_2$S${}_2$O
• Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe${}_2$, MoSe${}_2$ and MoTe${}_2$
• Prolonging Valley Polarization Lifetime through Gate-Controlled Exciton-to-Trion Conversion in Monolayer Molybdenum Ditelluride
• Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides
• Impact of indirect transitions on valley polarization in WS${}_2$ and WSe${}_2$
• Controlling valley splitting and Polarization of dark- and bi-excitons in monolayer WS${}_2$ by a tilted magnetic field
• Large g factor in bilayer WS${}_2$ flakes
• Tuning flat bands by interlayer interaction, spin-orbital coupling, and external fields in twisted homotrilayer MoS${}_2$
• Valley and spin splittings in a valley-layer-locked monolayer via atomic adsorption
• Electrical reversal of the sign for magnon thermal Hall coefficient in a van der Waals bilayer antiferromagnet
• Electromagnetic response and emergent topological orders in transition metal dichalcogenide MoTe${}_2$ bilayers
• Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
• Enhanced Valley Zeeman Splitting in Fe-Doped Monolayer MoS2