Probing the spin-polarized electronic band structure in monolayer transition metal dichalcogenides by optical spectroscopy
arXiv:1702.05647 · doi:10.1021/acs.nanolett.6b03855
Abstract
We study the electronic band structure in the K/K' valleys of the Brillouin zone of monolayer WSe2 and MoSe2 by optical reflection and photoluminescence spectroscopy on dual-gated field-effect devices. Our experiment reveals the distinct spin polarization in the conduction bands of these compounds by a systematic study of the doping dependence of the A and B excitonic resonances. Electrons in the highest-energy valence band and the lowest-energy conduction band have antiparallel spins in monolayer WSe2, and parallel spins in monolayer MoSe2. The spin splitting is determined to be hundreds of meV for the valence bands and tens of meV for the conduction bands, which are in good agreement with first principles calculations. These values also suggest that both n- and p-type WSe2 and MoSe2 can be relevant for spin- and valley-based applications
arXiv comment13 pages, 4 figures
References in corpus (38)
- 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
- Observation of tightly bound trions in monolayer MoS2
- 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
- Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
- Optical Spectrum of MoS: Many-body Effects and Diversity of Exciton States
- Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
- Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
- Tightly bound excitons in monolayer WSe2
- 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
- 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
- Electrical control of the valley Hall effect in bilayer MoS2 transistors
- Robust optical emission polarization in MoS2 monolayers through selective valley excitation
- Carrier and polarization dynamics in monolayer MoS2
- Generation and Electric Control of Spin-Coupled Valley Current in WSe2
- Spin-Layer Locking Effects in Optical Orientation of Exciton Spin in Bilayer WSe2
- Bright excitons in monolayer transition metal dichalcogenides: from Dirac cones to Dirac saddle points
- Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2
- Spin-orbit coupling, quantum dots, and qubits in monolayer transition metal dichalcogenides
- Splitting between Bright and Dark excitons in Transition Metal Dichalcogenide Monolayers
- Nonanalyticity, Valley Quantum Phases, and Light-like Exciton Dispersion in Monolayer TMDs: Theory and First-Principles Calculations
- WSe2 light-emitting tunneling transistors with enhanced brightness at room temperature
- Ultrafast and spatially resolved studies of charge carriers in atomically-thin molybdenum disulfide
- Transport Theory of Monolayer Transition-Metal Dichalcogenides through Symmetry
- Spin-orbit engineering in transition metal dichalcogenide alloy monolayers
- Magneto-optics in transition metal diselenide monolayers
- Spin- and valley-dependent magneto-optical properties of MoS2
- Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides
- Theory of intervalley Coulomb interactions in monolayer transition-metal dichalcogenides
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- Excitons in atomically thin transition metal dichalcogenides
- Moiré Excitons in Van der Waals Heterostructures
- Excitonic linewidth approaching the homogeneous limit in MoS2 based van der Waals heterostructures : accessing spin-valley dynamics
- Electrical control of interlayer exciton dynamics in atomically thin heterostructures
- In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
- Charged excitons in monolayer WSe: experiment and theory
- Spectroscopic studies of atomic defects and bandgap renormalization in semiconducting monolayer transition metal dichalcogenides
- Fine Structure and Lifetime of Dark Excitons in Transition Metal Dichalcogenide Monolayers
- Coulomb-bound four- and five-particle valleytronic states in an atomically-thin semiconductor
- Control of the Exciton Radiative Lifetime in van der Waals Heterostructures
- Electrical tuning of layer-polarized exciton gases in WSe2 bilayers
- The Coulomb interaction in monolayer transition-metal dichalcogenides
- Gate-tunable spin waves in antiferromagnetic atomic bilayers
- Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
- Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2
- Guide to optical spectroscopy of layered semiconductors
- Controlling excitons in an atomically thin membrane with a mirror
- Upconverted electroluminescence via Auger scattering of interlayer excitons in van der Waals heterostructures
- Probing Many-Body Interactions in Monolayer Transition-Metal Dichalcogenides
- Marrying excitons and plasmons in monolayer transition-metal dichalcogenides
- Dynamical screening in monolayer transition-metal dichalcogenides and its manifestations in the exciton spectrum
- Excitonic effects in the optical properties of 2D materials: An equation of motion approach
- Strongly interaction-enhanced valley magnetic response in monolayer WSe2
- Hexcitons and oxcitons in monolayer WSe
- Relaxation and darkening of excitonic complexes in electrostatically-doped monolayer semiconductors: Roles of exciton-electron and trion-electron interactions
- Virtual trions in the photoluminescence of monolayer transition-metal dichalcogenides
- Optically Probing Tunable Band Topology in Atomic Monolayers
- Radiative lifetime of localized excitons in transition metal dichalcogenides
- Every-other-layer Dipolar Excitons in a Spin-Valley locked Superlattice
- Broken adiabaticity induced by Lifshitz transition in MoS and WS single layers
- Many-body exciton and inter-valley correlations in heavily electron-doped WSe monolayers
- Twist angle dependent interlayer transfer of valley polarization from excitons to free charge carriers in WSe/MoSe heterobilayers
- Composite excitonic states in doped semiconductors
- Emergence of 6-particle "hexciton'' states in WS and MoSe monolayers
- Valley-selective exciton bistability in a suspended monolayer semiconductor
- Excitons and trions in monolayer semiconductors with correlated electrons
- WSe2/WS2 moiré superlattices: a new Hubbard model simulator
- Effects of dynamical dielectric screening on the excitonic spectrum of monolayer semiconductors
- Trion-trion annihilation in monolayer WS
- Tuning exciton recombination rates in doped transition metaldichalcogenides
- Rotons in Optical Excitation Spectra of Monolayer Semiconductors
- Monolayer Semiconductor Auger Detector
- Flat-band-induced many-body interactions and exciton complexes in a layered semiconductor
- Excitons in periodic potentials
- Ten-valley excitonic complexes in charge-tunable monolayer WSe
- Magneto-Optical Measurements of the Negatively Charged 2 Exciton in WSe
- Energy shifts and broadening of excitonic resonances in electrostatically-doped semiconductors
- Spin polarization in Lateral two-dimensional Heterostructures
- Testbeds for Transition Metal Dichalcogenide Photonics: Efficacy of Light Emission Enhancement in Monomer vs. Dimer Nanoscale Antennae
- Spin and valley filter based on two-dimensional WSe heterostructures
- Enhancement of valley polarization at high photoexcited densities in MoS2 monolayers
- How the dynamic of photo-induced gate screening complicates the investigation of valley physics in 2D materials