# Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals

@article{Gehlmann2016Quasi2E,
title={Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals},
author={Mathias Gehlmann and Irene Aguilera and Gustav Bihlmayer and Ewa Mlynczak and Markus Eschbach and Sven D{\"o}ring and P. Gospodari{\vc} and Stefan Cramm and Beata E. Kardynał and L Plucinski and Stefan Bl{\"u}gel and Claus Michael Schneider},
journal={Scientific Reports},
year={2016},
volume={6}
}
• M. Gehlmann, +9 authors C. Schneider
• Published 13 October 2015
• Physics, Materials Science, Medicine
• Scientific Reports
Time reversal dictates that nonmagnetic, centrosymmetric crystals cannot be spin-polarized as a whole. However, it has been recently shown that the electronic structure in these crystals can in fact show regions of high spin-polarization, as long as it is probed locally in real and in reciprocal space. In this article we present the first observation of this type of compensated polarization in MoS2 bulk crystals. Using spin- and angle-resolved photoemission spectroscopy (ARPES), we directly… Expand
31 Citations

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#### References

SHOWING 1-10 OF 71 REFERENCES
Direct observation of spin-polarized bulk bands in an inversion-symmetric semiconductor
The coupling between spin, valley and layer degrees of freedom in transition-metal dichalcogenides is shown to give rise to spin-polarized electron states, providing opportunities to create andExpand
Valley-dependent spin polarization in bulk MoS2 with broken inversion symmetry.
The direct observation of valley-dependent out-of-plane spin polarization in an archetypal transition-metal dichalcogenide--MoS2--using spin- and angle-resolved photoemission spectroscopy is reported, in fair agreement with a first-principles theoretical prediction. Expand
Probing two topological surface bands of Sb 2 Te 3 by spin-polarized photoemission spectroscopy
Using high resolution spin- and angle-resolved photoemission spectroscopy, we map the electronic structure and spin texture of the surface states of the topological insulator Sb2Te3. In combinationExpand
Control of valley polarization in monolayer MoS2 by optical helicity.
• Materials Science, Physics
• Nature nanotechnology
• 2012
It is demonstrated that optical pumping with circularly polarized light can achieve complete dynamic valley polarization in monolayer MoS(2) (refs 11, 12), a two-dimensional non-centrosymmetric crystal with direct energy gaps at two valleys. Expand
Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides.
• Physics, Medicine
• Physical review letters
• 2012
We show that inversion symmetry breaking together with spin-orbit coupling leads to coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides, making possible controlsExpand
Intrinsic circular polarization in centrosymmetric stacks of transition-metal dichalcogenide compounds.
• Physics, Medicine
• Physical review letters
• 2015
It is shown that also for n=even, where inversion symmetry is present and valley polarization physics is strictly absent, such intrinsic selectivity in CP is to be expected on the basis of fundamental spin-orbit physics. Expand
Direct measurement of the thickness-dependent electronic band structure of MoS2 using angle-resolved photoemission spectroscopy.
Micrometer-scale angle-resolved photoemission spectroscopy of mechanically exfoliated and chemical-vapor-deposition-grown crystals provides direct evidence for the shifting of the valence band maximum from Γ to K, for the case of MoS2 having more than one layer, to the case as predicted by density functional theory. Expand
Valley polarization in MoS2 monolayers by optical pumping.
• H. Zeng
• Medicine, Physics
• Nature nanotechnology
• 2012
It is demonstrated that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS(2), demonstrating the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS (2) monolayers. Expand
Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe2.
The first direct observation of the transition from indirect to direct bandgap in monolayer samples is reported by using angle-resolved photoemission spectroscopy on high-quality thin films of MoSe2 with variable thickness, grown by molecular beam epitaxy. Expand
Spin polarization and transport of surface states in the topological insulators Bi2Se3 and Bi2Te3 from first principles.
• Physics, Medicine
• Physical review letters
• 2010
A way of controlling the magnitude of spin polarization associated with a charge current in thin films of topological insulators by means of an external electric field is proposed and the proposed dual-gate device configuration provides new possibilities for electrical control of spin. Expand