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Zhang, Duan; Wu, Yecun; Yu-Hsin, Su; Ming-Chien Hsu; Cormac Ó Coileáin; Cho, Jiung; Choi, Miri; Byong Sun Chun; Guo, Yao; Ching-Ray, Chang; Han-Chun, Wu
IUCrJ, 09/2020, Letnik: 7, Številka: 5Journal Article
Charge density waves spontaneously breaking lattice symmetry through periodic lattice distortion, and electron–electron and electron–phonon interactions, can lead to a new type of electronic band structure. Bulk 2H-TaS2 is an archetypal transition metal dichalcogenide supporting charge density waves with a phase transition at 75 K. Here, it is shown that charge density waves can exist in exfoliated monolayer 2H-TaS2 and the transition temperature can reach 140 K, which is much higher than that in the bulk. The degenerate breathing and wiggle modes of 2H-TaS2 originating from the periodic lattice distortion are probed by optical methods. The results open an avenue to investigating charge density wave phases in two-dimensional transition metal dichalcogenides and will be helpful for understanding and designing devices based on charge density waves.
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