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The extraordinary properties of two dimensional (2D) materials, such as theextremely high carrier mobility in graphene and the large direct band gaps intransition metal dichalcogenides MX2 (M = Mo or W, X = S, Se) monolayers,highlight the crucial role quantum confinement can have in producing a widespectrum of technologically important electronic properties. Currently one ofthe highest priorities in the field is to search for new 2D crystalline systemswith structural and electronic properties that can be exploited for devicedevelopment. In this letter, we report on the unusual quantum transportproperties of the 2D ternary transition metal chalcogenide - Nb3SiTe6. We showthat the micaceous nature of Nb3SiTe6 allows it to be thinned down toone-unit-cell thick 2D crystals using microexfoliation technique. When thethickness of Nb3SiTe6 crystal is reduced below a few unit-cells thickness, weobserved an unexpected, enhanced weak-antilocalization signature inmagnetotransport. This finding provides solid evidence for the long-predictedsuppression of electron-phonon interaction caused by the crossover of phononspectrum from 3D to 2D.

Enhancing Electron Coherence via Quantum Phonon Confinement in Atomically Thin Nb3SiTe6