title: Titanium trisulfide (TiS3): a 2D semiconductor with quasi-1D optical and electronic properties.
abstract: We present characterizations of few-layer titanium trisulfide (TiS3) flakes which, due to their reduced in-plane structural symmetry, display strong anisotropy in their electrical and optical properties. Exfoliated few-layer flakes show marked anisotropy of their in-plane mobilities reaching ratios as high as 7.6 at low temperatures. Based on the preferential growth axis of TiS3 nanoribbons, we develop a simple method to identify the in-plane crystalline axes of exfoliated few-layer flakes through angle resolved polarization Raman spectroscopy. Optical transmission measurements show that TiS3 flakes display strong linear dichroism with a magnitude (transmission ratios up to 30) much greater than that observed for other anisotropic two-dimensional (2D) materials. Finally, we calculate the absorption and transmittance spectra of TiS3 in the random-phase-approximation (RPA) and find that the calculations are in qualitative agreement with the observed experimental optical transmittance.
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
authors.forename: Joshua O
authors.initials: JO
authors.lastname: Island
authors.affiliation: Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del Pais Vasco, 20018 San Sebastian, Spain.
authors.forename: Robert
authors.initials: R
authors.lastname: Biele
authors.affiliation: Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Mariam
authors.initials: M
authors.lastname: Barawi
authors.affiliation: Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: José M
authors.initials: JM
authors.lastname: Clamagirand
authors.affiliation: Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: José R
authors.initials: JR
authors.lastname: Ares
authors.affiliation: Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.|Inst. Nicolas Cabrera, Univ. Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Sánchez
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
authors.forename: Herre S J
authors.initials: HS
authors.lastname: van der Zant
authors.affiliation: Materials of Interest in Renewable Energies Group (MIRE Group), Dpto. de Física de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain.|Inst. Nicolas Cabrera, Univ. Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Isabel J
authors.initials: IJ
authors.lastname: Ferrer
authors.affiliation: Nano-Bio Spectroscopy Group and European Theoretical Spectroscopy Facility (ETSF), Universidad del Pais Vasco, 20018 San Sebastian, Spain.|IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.
authors.forename: Roberto
authors.initials: R
authors.lastname: D'Agosta
authors.affiliation: Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.|Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanociencia), Campus de Cantoblanco, 28049 Madrid, Spain.
authors.forename: Andres
authors.initials: A
authors.lastname: Castellanos-Gomez