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Charge density wave (CDW) states in solids bear an intimate connection tounderlying fermiology. Modification of the latter by a suitable perturbationprovides an attractive handle to unearth novel CDW states. Here, we combineextensive magnetotransport experiments and first-principles electronicstructure calculations on a non-magnetic tritelluride LaTe$_{3}$ single crystalto uncover phenomena rare in CDW systems: $(i)$ hump-like feature in thetemperature dependence of resistivity at low temperature under application ofmagnetic field, which moves to higher temperature with increasing fieldstrength, $(ii)$ highly anisotropic large transverse magnetoresistance (MR)upon rotation of magnetic field about current parallel to crystallographicc-axis, (iii) anomalously large positive MR with spike-like peaks atcharacteristic angles when the angle between current and field is varied in thebc-plane, (iv) extreme sensitivity of the angular variation of MR on field andtemperature. Moreover, our Hall measurement reveals remarkably high carriermobility $\sim$ 33000 cm$^{2}$/Vs, which is comparable to that observed in sometopological semimetals. These novel observations find a comprehensiveexplication in our density functional theory (DFT) and dynamical mean fieldtheory (DMFT) calculations that capture field-induced electronic structuremodification in LaTe$_{3}$. The band structure theory together with transportcalculations suggest the possibility of a second field-induced CDW transitionfrom the field-reconstructed Fermi surface, which qualitatively explains thehump in temperature dependence of resistivity at low temperature. Thus, ourstudy exposes the novel manifestations of the interplay between CDW order andfield-induced electronic structure modifications in LaTe$_{3}$, and establishesa new route to tune CDW states by perturbations like magnetic field.

Fascinating interplay between Charge Density Wave Order and magnetic field in Non-magnetic Rare-Earth Tritelluride LaTe$_{3}$