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Layered van der Waals semimetallic $T_\mathrm{d}$-WTe$_{2}$, exhibitingintriguing properties which include non-saturating extreme positivemagnetoresistance (MR) and tunable chiral anomaly, has emerged as modeltopological type-II Weyl semimetal system. Here, $\sim$45 nm thick mechanicallyexfoliated flakes of $T_\mathrm{d}$-WTe$_{2}$ are studied $via$ atomic forcemicroscopy, Raman spectroscopy, low-$T$/high-$\mu_{0}H$ magnetotransportmeasurements and optical reflectivity. The contribution of anisotropy of theFermi liquid state to the origin of the large positive transverse$\mathrm{MR}_\perp$ and the signature of chiral anomaly of the type-II Weylfermions are reported. The samples are found to be stable in air and nooxidation or degradation of the electronic properties are observed. Atransverse $\mathrm{MR}_\perp$ $\sim$1200\,\% and an average carrier mobilityof $5000$\, cm$^{2}$V$^{-1}$s$^{-1}$ at $T=5\,\mathrm{K}$ for an appliedperpendicular field $\mu_{0}H_{\perp} = 7\,\mathrm{T}$ are established. Thesystem follows a Fermi liquid model for $T\leq50\,\mathrm{K}$ and theanisotropy of the Fermi surface is concluded to be at the origin of theobserved positive MR. The anisotropy of the electronic behaviour is alsoconfirmed by optical reflectivity measurements. The relative orientation of thecrystal axes and of the applied electric and magnetic fields is proven to giverise to the observed chiral anomaly in the in-plane magnetotransport.

Positive magnetoresistance and chiral anomaly in exfoliated type-II Weyl semimetal $T_\mathrm{d}$-WTe$_{2}$