Author:
Zhang Duan,Wu Yecun,Su Yu-Hsin,Hsu Ming-Chien,Ó Coileáin Cormac,Cho Jiung,Choi Miri,Chun Byong Sun,Guo Yao,Chang Ching-Ray,Wu Han-Chun
Abstract
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.
Funder
National Natural Science Foundation of China
Publisher
International Union of Crystallography (IUCr)
Subject
Condensed Matter Physics,General Materials Science,Biochemistry,General Chemistry
Cited by
3 articles.
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