title: Spin-orbit coupling in the band structure of monolayer WSe2.
abstract: We used angle-resolved photoemission spectroscopy (ARPES) to map out the band structure of single-layer WSe2. The splitting of the top of the valence band because of spin-orbit coupling is 513 ± 10 meV, in general agreement with theoretical predictions and in the same range as that of bulk WSe2. Overall, our density functional theory (DFT) calculations of the band structure are in excellent agreement with the ARPES results. We have verified that the few discrepancies between theory and experiment are not due to the effect of strain. The differences between the DFT-calculated band structure using local density approximation (LDA) and that using the generalized gradient approximation (GGA), for single-layer WSe2, are caused mainly by differences in the respective charge densities.
authors.affiliation: Department of Physics, University of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816,USA.
authors.forename: Duy
authors.initials: D
authors.lastname: Le
authors.forename: Alexei
authors.initials: A
authors.lastname: Barinov
authors.forename: Edwin
authors.initials: E
authors.lastname: Preciado
authors.forename: Miguel
authors.initials: M
authors.lastname: Isarraraz
authors.forename: Iori
authors.initials: I
authors.lastname: Tanabe
authors.forename: Takashi
authors.initials: T
authors.lastname: Komesu
authors.forename: Conrad
authors.initials: C
authors.lastname: Troha
authors.forename: Ludwig
authors.initials: L
authors.lastname: Bartels
authors.forename: Talat S
authors.initials: TS
authors.lastname: Rahman
authors.forename: Peter A
authors.initials: PA
authors.lastname: Dowben