Enhanced Valley Zeeman Splitting in Fe-Doped Monolayer MoS2

Abstract

The Zeeman effect offers unique opportunities for magnetic manipulation of the spin degree of freedom (DOF). Recently, valley Zeeman splitting, referring to the lifting of valley degeneracy, has been demonstrated in two-dimensional transition metal dichalcogenides (TMDs) at liquid helium temperature. However, to realize the practical applications of valley pseudospins, the valley DOF must be controllable by a magnetic field at room temperature, which remains a significant challenge. Magnetic doping in TMDs can enhance the Zeeman splitting, however, to achieve this experimentally is not easy. Here, we report unambiguous magnetic manipulation of valley Zeeman splitting at 300 K (g = -6.4) and 10 K (g = -11) in a CVD-grown Fe-doped MoS2 monolayer; the effective g factor can be tuned to -20.7 by increasing the Fe dopant concentration, which represents an approximately fivefold enhancement as compared to undoped MoS2. Our measurements and calculations reveal that the enhanced splitting and geff factors are due to the Heisenberg exchange interaction of the localized magnetic moments (Fe 3d electrons) with MoS2 through the d-orbital hybridization.

References in corpus (21)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Valley polarization in MoS2 monolayers by optical pumping
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Electronic spin transport and spin precession in single graphene layers at room temperature
• Vapor Phase Growth and Grain Boundary Structure of Molybdenum Disulfide Atomic Layers
• Giant Tunneling Magnetoresistance in Spin-Filter van der Waals Heterostructures
• Large-Area Aiming Synthesis of WSe2 Monolayers
• Magnetic Control of Valley Pseudospin in Monolayer WSe2
• Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
• Breaking of valley degeneracy by magnetic field in monolayer MoSe2
• Ferromagnetic Semiconductors: Moving Beyond (Ga,Mn)As
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field
• Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS${}_2$ and MoS${}_2$ to 65 Tesla
• Giant paramagnetism induced valley polarization of electrons in charge-tunable monolayer MoSe2
• Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe${}_2$
• Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2
• Strongly interaction-enhanced valley magnetic response in monolayer WSe2