Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla

@article{Stier2016ExcitonDS,
  title={Exciton diamagnetic shifts and valley Zeeman effects in monolayer WS2 and MoS2 to 65 Tesla},
  author={Andreas V. Stier and Kathleen M. McCreary and Berend T. Jonker and Junichiro Kono and Scott A. Crooker},
  journal={Nature Communications},
  year={2016},
  volume={7}
}
In bulk and quantum-confined semiconductors, magneto-optical studies have historically played an essential role in determining the fundamental parameters of excitons (size, binding energy, spin, dimensionality and so on). Here we report low-temperature polarized reflection spectroscopy of atomically thin WS2 and MoS2 in high magnetic fields to 65 T. Both the A and B excitons exhibit similar Zeeman splittings of approximately −230 μeV T−1 (g-factor ≃−4), thereby quantifying the valley Zeeman… 
Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts
We experimentally study the radii of excitons in hBN-encapsulated WS2 monolayers by means of magneto-optical reflectance spectroscopy at cryogenic temperatures in magnetic fields up to 29 T. We
Excitonic Valley Effects in Monolayer WS2 under High Magnetic Fields.
TLDR
A monolayer of tungsten disulfide in high magnetic fields up to 30 T via photoluminescence spectroscopy at low temperatures is investigated and the field dependence of the trion valley polarizations is in line with the predicted trion splitting into singlet and triplet configurations.
A ug 2 01 9 Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
In semiconductor physics, many essential optoelectronic material parameters can be experimentally revealed via optical spectroscopy in sufficiently large magnetic fields. For monolayer
The Zeeman splitting of bulk 2H-MoTe2 single crystal in high magnetic field
A high magnetic field magneto-optical spectrum is utilized to study the A exciton of bulk 2H-MoTe2 single crystal. A clear Zeeman splitting of the A exciton is observed under high magnetic fields up
Zeeman spectroscopy of excitons and hybridization of electronic states in few-layer WSe 2 , MoSe 2 and MoTe 2
Monolayers and multilayers of semiconducting transition metal dichalcogenides (TMDCs) offer an ideal platform to explore valley-selective physics with promising applications in valleytronics and
Valley Zeeman Splitting and Valley Polarization of Neutral and Charged Excitons in Monolayer MoTe2 at High Magnetic Fields.
Semiconducting transition metal dichalcogenides (TMDCs) give rise to interesting new phenomena in external magnetic fields, such as valley Zeeman splitting and magnetic-field-induced valley
Valley Zeeman splitting of monolayer MoS2 probed by low-field magnetic circular dichroism spectroscopy at room temperature
The valley Zeeman splitting of monolayer two-dimensional (2D) materials in the magnetic field plays an important role in the valley and spin manipulations. In general, a high magnetic field (6–65 T)
Orbital, spin and valley contributions to Zeeman splitting of excitonic resonances in MoSe 2 , WSe 2 and WS 2 Monolayers
We present a comprehensive optical study of the excitonic Zeeman effects in transition metal dichalcogenide monolayers, which are discussed comparatively for selected materials: MoSe$_2$, WSe$_2$ and
Spin-Selective Hole-Exciton Coupling in a V-Doped WSe2 Ferromagnetic Semiconductor at Room Temperature.
TLDR
Using transient absorption spectroscopy, this work elucidates the origin of excitons and trions that are inherently distinct for defect-mediated and impurity-mediated trions and reports anomalous circularly polarized photoluminescence in a V-doped WSe2 monolayer at room temperature.
...
...

References

SHOWING 1-10 OF 77 REFERENCES
Optical Investigation of Monolayer and Bulk Tungsten Diselenide (WSe₂) in High Magnetic Fields.
Optical spectroscopy in high magnetic fields B ≤ 65 T is used to reveal the very different nature of carriers in monolayer and bulk transition metal dichalcogenides. In monolayer WSe2, the exciton
Giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor.
TLDR
The renormalized bandgap and large exciton binding observed here will have a profound impact on electronic and optoelectronic device technologies based on single-layer semiconducting TMDs.
Valley splitting and polarization by the Zeeman effect in monolayer MoSe2.
TLDR
This work has measured circularly polarized photoluminescence in monolayer MoSe2 under perpendicular magnetic fields up to 10 T and the magnitude of the Zeeman shift agrees with predicted magnetic moments for carriers in the conduction and valence bands.
Magneto-optics in transition metal diselenide monolayers
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
Excitonic effects in 2D semiconductors: Path Integral Monte Carlo approach
One of the most striking features of novel 2D semiconductors (e.g., transition metal dichalcogenide monolayers or phosphorene) is a strong Coulomb interaction between charge carriers resulting in
Excitonic effects in 2 D semiconductors : Path Integral Monte Carlo approach
One of the most striking features of novel 2D semiconductors (e.g., transition metal dichalcogenide monolayers or phosphorene) is a strong Coulomb interaction between charge carriers resulting in
Probing excitonic dark states in single-layer tungsten disulphide
TLDR
Experimental evidence of a series of excitonic dark states in single-layer WS2 using two-photon excitation spectroscopy is reported, and it is proved that the excitons are of Wannier type, meaning that each exciton wavefunction extends over multiple unit cells, but with extraordinarily large binding energy.
Dielectric screening of excitons and trions in single-layer MoS2.
TLDR
These findings are helpful to better understand the tightly bound exciton properties in strongly quantum-confined systems and provide a simple approach to the selective and separate generation of excitons or trions with potential applications in excitonic interconnects and valleytronics.
Excitonic effects in two-dimensional semiconductors: Path integral Monte Carlo approach
One of the most striking features of novel two-dimensional semiconductors (e.g., transition metal dichalcogenide monolayers or phosphorene) is a strong Coulomb interaction between charge carriers
...
...