Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$

Abstract

We report magneto-optical spectroscopy of gated monolayer MoS${}_2$ in high magnetic fields up to 28T and obtain new insights on the many-body interaction of neutral and charged excitons with the resident charges of distinct spin and valley texture. For neutral excitons at low electron doping, we observe a nonlinear valley Zeeman shift due to dipolar spin-interactions that depends sensitively on the local carrier concentration. As the Fermi energy increases to dominate over the other relevant energy scales in the system, the magneto-optical response depends on the occupation of the fully spin-polarized Landau levels in both $K/K^{\prime }$ valleys. This manifests itself in a many-body state. Our experiments demonstrate that the exciton in monolayer semiconductors is only a single particle boson close to charge neutrality. We find that away from charge neutrality it smoothly transitions into polaronic states with a distinct spin-valley flavour that is defined by the Landau level quantized spin and valley texture.

Main manuscript: 7 pages, 4 figures ; Supplemental material: 20 pages, 8 figures

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Cited by in corpus (19)

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• Spin-defect characteristics of single sulfur vacancies in monolayer ${\text{MoS}}_2$
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• Optical dipole orientation of interlayer excitons in MoSe${}_2$-WSe${}_2$ heterostacks
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Valley Degree of Freedom in Two-Dimensional van der Waals Materials
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Tuning the Optical Properties of an MoSe${}_2$ Monolayer Using Nanoscale Plasmonic Antennas
• Tunable magneto-optical properties in MoS${}_2$ via defect-induced exciton transitions
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Electrical control of orbital and vibrational interlayer coupling in bi- and trilayer 2H-MoS${}_2$
• Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Electrostatic control of the trion fine structure in transition metal dichalcogenide monolayers
• Trapping the carrier in the spin-locked MoS2 atomic valley by absorption of chiral L-cysteine
• Efficient valley polarization of charged excitons and resident carriers in MoS2 monolayers by optical pumping
• Magnetoexcitons and Massive Dirac Fermions in Monolayers of Transition Metal Dichalcogenides in a High Magnetic Field