Magneto-optics in transition metal diselenide monolayers

Abstract

We perform photoluminescence experiments at 4K on two different transition metal diselenide monolayers, namely MoSe2 and WSe2 in magnetic fields $B_z$ up to 9T applied perpendicular to the sample plane. In MoSe2 monolayers the valley polarization of the neutral and the charged exciton (trion) can be tuned by the magnetic field, independent of the excitation laser polarization. In the investigated WSe2 monolayer sample the evolution of the trion valley polarization depends both on the applied magnetic field and the excitation laser helicity, while the neutral exciton valley polarization depends only on the latter. Remarkably we observe a reversal of the sign of the trion polarization between WSe2 and MoSe2. For both systems we observe a clear Zeeman splitting for the neutral exciton and the trion of about $\pm 2$meV at $B_z\mp 9$T. The extracted Landé-factors for both exciton complexes in both materials are $g\approx -4$.

arXiv comment9 pages, 2 figures

References in corpus (37)

• Atomically thin MoS2: A new direct-gap semiconductor
• 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
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• The Valley Hall Effect in MoS2 Transistors
• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
• Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
• Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe2
• Tightly bound excitons in monolayer WSe2
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Probing Excitonic Dark States in Single-layer Tungsten Disulfide
• Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
• 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
• Electronic structures and theoretical modelling of two-dimensional group-VIB transition metal dichalcogenides
• Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
• Valley Splitting and Polarization by the Zeeman Effect in Monolayer MoSe2
• Large spin splitting in the conduction band of transition metal dichalcogenide monolayers
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Probing excitonic states in ultraclean suspended two-dimensional semiconductors by photocurrent spectroscopy
• Monolayer MoS2: trigonal warping, "Γ-valley", and spin-orbit coupling effects
• Tight-binding model and direct-gap/indirect-gap transition in single-layer and multi-layer MoS${}_2$
• Valley dynamics probed through charged and neutral exciton emission in monolayer WSe2
• Nuclear spin physics in quantum dots: an optical investigation
• Direct observation of spin-polarised bulk bands in an inversion-symmetric semiconductor
• Bright excitons in monolayer transition metal dichalcogenides: from Dirac cones to Dirac saddle points
• Valley depolarization due to inter- and intra-valley electron-hole exchange interactions in monolayer MoS${}_2$
• Exciton fine structure and spin decoherence in monolayers of transition metal dichalcogenides
• Spin-orbit coupling, quantum dots, and qubits in monolayer transition metal dichalcogenides
• Effective lattice Hamiltonian for monolayer MoS2 : Tailoring electronic structure with perpendicular electric and magnetic fields
• Polarization and time-resolved photoluminescence spectroscopy of excitons in MoSe2 monolayers
• Excitonic Collapse in Semiconducting Transition Metal Dichalcogenides
• Charge tuning in [111] grown GaAs droplet quantum dots

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