Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS, WSe, MoS and MoWS: publisher's note.

This publisher's note amends the Funding section of a recent publication [Opt. Express24, 20685 (2016].

Nonlinear optical responses in two-dimensional transition metal dichalcogenide multilayer: WS, WSe, MoS and Mo W S.

Synthetic two-dimensional transition metal dichalcogenides such as, tungsten disulphide (WS), tungsten diselenide (WSe), molybdenum disulphide (MoS) as well as mixed molybdenum tungsten disulphide (MoWS) single crystals were grown by the chemical vapor transport method using halogens (bromine or chlorine) as transport agents. Multi- layer samples were cleaved from the single crystals, and their nonlinear optical (NLO) properties were obtained from both open aperture and closed aperture Z-scan measurements using a picosecond mode-locked Nd: YAG laser operating at a wavelength of 1064 nm, with pulse duration of 25 ps, and 20 Hz repetition rate. Both WS and MoS exhibited nonlinear saturable absorption (SA), whereas WSe and MoWS showed nonlinear two-photon absorption (2PA).

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 emission shifts linearly with the magnetic field and exhibits a splitting that originates from the magnetic field induced valley splitting. The monolayer data can be described using a single particle picture with a Dirac-like Hamiltonian for massive Dirac Fermions, with an additional term to phenomenologically include the valley splitting.

Strong thermo-induced single and two-photon green luminescence in self-organized peptide microtubes.

Diphenylalanine peptide nano- and microtubes formed by self-assembly demonstrate strongly enhanced and tunable single-photon and two-photon luminescence in the visible range, which appears after heat- or laser treatment of these self-organized peptide microtubes. This process significantly extends the functionality of these microstructures and can trigger a new interest in the optical properties of structures based on short peptides.

Spectroscopic characterization of Ti-doped α-ZnAl2S4 spinel-type single crystals.

The spectroscopic characteristics of the α-ZnAl(2)S(4) wide bandgap semiconductor doped with Ti ions are investigated. It is shown, that the ZnAl(2)S(4):Ti spinel-type crystals exhibit luminescence in the IR spectral range 0.8-1.