title: Quasi 2D electronic states with high spin-polarization in centrosymmetric MoS2 bulk crystals.
abstract: 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 observed a spin-polarization of more than 65% for distinct valleys in the electronic band structure. By additionally evaluating the probing depth of our method, we find that these valence band states at the point in the Brillouin zone are close to fully polarized for the individual atomic trilayers of MoS2, which is confirmed by our density functional theory calculations. Furthermore, we show that this spin-layer locking leads to the observation of highly spin-polarized bands in ARPES since these states are almost completely confined within two dimensions. Our findings prove that these highly desired properties of MoS2 can be accessed without thinning it down to the monolayer limit.
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Gehlmann
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich GmbH and JARA, D-52425 Jülich, Germany.
authors.forename: Irene
authors.initials: I
authors.lastname: Aguilera
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich GmbH and JARA, D-52425 Jülich, Germany.
authors.forename: Gustav
authors.initials: G
authors.lastname: Bihlmayer
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.|Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: Ewa
authors.initials: E
authors.lastname: Młyńczak
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Eschbach
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Döring
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Pika
authors.initials: P
authors.lastname: Gospodarič
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Cramm
authors.affiliation: PGI-9, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Beata
authors.initials: B
authors.lastname: Kardynał
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Plucinski
authors.affiliation: Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich GmbH and JARA, D-52425 Jülich, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Blügel
authors.affiliation: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Claus M
authors.initials: CM
authors.lastname: Schneider