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Charge density waves (CDW) and their concomitant periodic lattice distortions(PLD) govern the electronic properties in many layered transition-metaldichalcogenides. In particular, 1T-TaS2 undergoes a metal-to-insulator phasetransition as the PLD becomes commensurate with the crystal lattice. Here wedirectly image PLDs of the nearly-commensurate (NC) and commensurate (C) phasesin thin exfoliated 1T-TaS2 using atomic resolution scanning transmissionelectron microscopy at room and cryogenic temperature. At low temperatures, weobserve commensurate PLD superstructures, suggesting ordering of the CDWs bothin- and out-of-plane. In addition, we discover stacking transitions in theatomic lattice that occur via one bond length shifts. Interestingly, the NCPLDs exist inside both the stacking domains and their boundaries. Transitionsin stacking order are expected to create fractional shifts in the CDW betweenlayers and may be another route to manipulate electronic phases in layereddichalcogenides.

Atomic Lattice Disorder in Charge Density Wave Phases of Exfoliated Dichalcogenides (1T-TaS2)