Spin-Polarized Electrons in Monolayer MoS${}_2$

Abstract

The optical susceptibility is a local, minimally-invasive and spin-selective probe of the ground state of a two-dimensional electron gas. We apply this probe to a gated monolayer of MoS${}_2$. We demonstrate that the electrons are spin polarized. Of the four available bands, only two are occupied. These two bands have the same spin but different valley quantum numbers. We argue that strong Coulomb interactions are a key aspect of this spontaneous symmetry breaking. The Bohr radius is so small that even electrons located far apart in phase space interact, facilitating exchange couplings to align the spins.

References in corpus (19)

• Atomically thin MoS2: A new direct-gap semiconductor
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Observation of tightly bound trions in monolayer MoS2
• Exciton Binding Energy and Nonhydrogenic Rydberg Series in Monolayer WS2
• Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
• Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Enhanced valley splitting in monolayer WSe2 due to magnetic exchange field
• Correlation energy and spin polarization in the 2D electron gas
• Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS${}_2$ and MoS${}_2$ to 65 Tesla
• Valley excitons in two-dimensional semiconductors
• Charged excitons in monolayer WSe${}_2$: experiment and theory
• Many-Body Theory of Trion Absorption Features in Two-Dimensional Semiconductors
• Valley-spin polarized Landau levels in a monolayer semiconductor
• Interactions and magnetotransport through spin-valley coupled Landau levels in monolayer MoS${}_2$
• Giant paramagnetism induced valley polarization of electrons in charge-tunable monolayer MoSe2
• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Theory of intervalley Coulomb interactions in monolayer transition-metal dichalcogenides
• Spin susceptibility of interacting two-dimensional electrons in the presence of spin-orbit coupling

Cited by in corpus (39)

• Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
• Measurement of the Spin-Forbidden Dark Excitons in MoS2 and MoSe2 monolayers
• Giant Stark splitting of an exciton in bilayer MoS${}_2$
• Technical Review: Imaging weak magnetic field patterns on the nanometer-scale and its application to 2D materials
• Accessing high optical quality of MoS2 monolayers grown by chemical vapor deposition
• Dark trions govern the temperature-dependent optical absorption and emission of doped atomically thin semiconductors
• Moiré-trapped interlayer trions in a charge-tunable WSe${}_2$/MoSe${}_2$ heterobilayer
• Ground and Excited Exciton Polarons in Monolayer MoSe2
• Magnetooptics of layered two-dimensional semiconductors and heterostructures: progress and prospects
• Giant effective Zeeman splitting in a monolayer semiconductor realized by spin-selective strong light-matter coupling
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Exposing the trion's fine structure by controlling the carrier concentration in hBN-encapsulated MoS${}_2$
• Enhancement of Exciton Valley Polarization in Monolayer MoS2 Induced by Scattering
• First-order magnetic phase-transition of mobile electrons in monolayer MoS${}_2$
• Polaron spectroscopy of a bilayer excitonic insulator
• Many-body exciton and inter-valley correlations in heavily electron-doped WSe${}_2$ monolayers
• Valley two-qubit system in a MoS${}_2$-monolayer gated double quantum dot
• Vacancy tuned thermoelectric properties and high spin filtering performance in graphene/silicene heterostructures
• Superconducting contacts to a monolayer semiconductor
• Trions in MoS${}_2$ are quantum superpositions of intra- and intervalley spin states
• Local field effects in ultrafast light-matter interaction measured by pump-probe spectroscopy of monolayer MoSe${}_2$
• Exchange Intervalley Scattering And Magnetic Phase Diagram Of Transition Metal Dichalcogenide Monolayers
• Wigner Crystals in Two-Dimensional Transition-Metal Dichalcogenides: Spin Physics and Readout
• Capacitively-coupled and inductively-coupled excitons in bilayer MoS${}_2$
• Emergence of 6-particle "hexciton'' states in WS${}_2$ and MoSe${}_2$ monolayers
• Excited-State Trions in Two Dimensional Materials
• Valley and spin polarized broken symmetry states of interacting electrons in gated MoS${}_2$ quantum dots
• Instability of the ferromagnetic quantum critical point in strongly interacting 2D and 3D electron gases with arbitrary spin-orbit splitting
• Proximity-enhanced valley Zeeman splitting at the WS${}_2$/graphene interface
• Ising and XY paramagnons in two-dimensional 2H-NbSe${}_2$
• Modelling excitonic Mott transitions in two-dimensional semiconductors
• Doping-induced non-Markovian interference causes excitonic linewidth broadening in monolayer WSe${}_2$
• Spin susceptibility in interacting two-dimensional semiconductors and bilayer systems at first order: Kohn anomalies and spin density wave ordering
• Magnetic phase transitions in two-dimensional two-valley semiconductors with in-plane magnetic field
• Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
• Coherent electron dynamics in monolayer ${\text{MoS}}_2$ under ultrashort optical pulse
• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in 2H-NbS2 flakes
• Strong intervalley correlation induced a magnetic order transition in monolayer ${\text{MoS}}_2$
• Anomalous Landau level gaps near magnetic transitions in monolayer WSe${}_2$