Cooperative interplay between impurities and charge density wave in the phase transition of atomic wires
- Authors
- Shim, Hyungjoon; Lee, Geunseop; Hyun, Jung-Min; Kim, Hanchul
- Issue Date
- Sep-2015
- Publisher
- IOP PUBLISHING LTD
- Keywords
- phase transition; impurity; charge density wave; scanning tunneling microscopy; ab initio calculation
- Citation
- NEW JOURNAL OF PHYSICS, v.17
- Journal Title
- NEW JOURNAL OF PHYSICS
- Volume
- 17
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/10235
- DOI
- 10.1088/1367-2630/17/9/093026
- ISSN
- 1367-2630
- Abstract
- Impurities interact with a charge density wave (CDW) and affect the phase transitions in low-dimensional systems. By using scanning tunneling microscopy, we visualize the interaction between oxygen impurities and the CDW in indium atomic wires on Si(111), a prototypical one-dimensional electronic system, and unveil the microscopic mechanism of the intriguing O-induced increase of the transition temperature (T-c). Driven by the fluctuating CDW, the O atoms adopt an asymmetric structure. By adjusting the asymmetry, a pair of O impurities in close distance can pin the one-dimensional CDW, which develops into the two-dimensional domains. First-principles calculations showed that the asymmetric interstitially-incorporated O defects induce shear strains, which assists the formation of hexagon structure of the CDW phase. The cooperative interplay between the O impurities and the CDW is responsible for the enhancement of the CDW condensation and the consequent increase in T-c.
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