Faculty Publications
Distinct Surface And Bulk Charge Density Waves In Ultrathin 1T-Ta S2
Document Type
Article
Journal/Book/Conference Title
Physical Review B - Condensed Matter and Materials Physics
Volume
94
Issue
20
Abstract
We employ low-frequency Raman spectroscopy to study the nearly commensurate (NC) to commensurate (C) charge density wave (CDW) transition in 1T-TaS2 ultrathin flakes protected from oxidation. We identify additional modes originating from C-phase CDW phonons that are distinct from those seen in bulk 1T-TaS2. We attribute these to CDW modes from the surface layers. By monitoring individual modes with temperature, we find that surfaces undergo a separate, low-hysteresis NC-C phase transition that is decoupled from the transition in the bulk layers. This indicates the activation of a secondary phase nucleation process in the limit of weak interlayer interaction, which can be understood from energy considerations.
Original Publication Date
1-1-2016
DOI of published version
10.1103/PhysRevB.94.201108
Repository
UNI ScholarWorks, Rod Library, University of Northern Iowa
Language
en
Recommended Citation
He, Rui; Ye, Zhipeng; Ye, Gaihua; Anderson, Heidi; Dai, Xia; Wu, Xianxin; Hu, Jiangping; Liu, Yu; Lu, Wenjian; Sun, Yuping; Pasupathy, Abhay N.; and Tsen, Adam W., "Distinct Surface And Bulk Charge Density Waves In Ultrathin 1T-Ta S2" (2016). Faculty Publications. 1156.
https://scholarworks.uni.edu/facpub/1156
