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.
Highlights
The isolation of graphene and similar atomically-thin, van der Waals materials has sparked a strong research focus on this broad family which can be exfoliated from bulk layered crystals[1,2,3]
Correspondence and requests for materials should be addressed to J.O.I. or R.D.A. or A.C.G. www.nature.com/scientificreports/
We note that the Raman spectra of thin flakes show strong in-plane anisotropy that can be used to identify the crystalline orientation of 2D, few-layer TiS3 samples
Summary
The isolation of graphene and similar atomically-thin, van der Waals materials has sparked a strong research focus on this broad family which can be exfoliated from bulk layered crystals[1,2,3]. Despite this growing interest, the research focus has been mainly limited to graphene, boron nitride, and the Mo- and W- based transition metal dichalcogenides[4,5,6,7]. To better understand these findings we calculate the absorption and transmittance spectra in the random-phase-approximation (RPA)[22,23,24] and find that the calculations are in qualitative agreement with our experimental findings
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