Charge Transfer, Phase Separation, and Mott-Hubbard Transition in Potassium-Doped Coronene Films

Wu, Xuefeng1; Xu, Chaoqiang1; Wang, Kedong2; Xiao, Xudong1

2016-07-21

10.1021/acs.jpcc.6b03686

Journal of Physical Chemistry C   影响因子和分区

1932-7447

Scanning tunneling microscopy and spectroscopy have been applied to study the pristine and potassium-doped coronene films at the molecular level with the doping ratio x ranging from 0 to 4. Both the morphology and the electronic property were found to be strongly governed by the amount of charge transfer. Certain phases of K(3)Coronene and K(4)Coronene could be fabricated at the corresponding K doping ratios. While in K(4)Coronene a doubly degenerate LUMO state of the undoped coronene became fully occupied, in K(3)Coronene that state was observed to cross the Fermi level and split into an upper unoccupied part and a lower occupied part, implying the presence of electronic correlation effect and Mott-Hubbard transition in the system. The observed four different phases of K(3)Coronene further showed different strengths of electronic correlation effect and led us to speculate that the superconductivity transition with different T-c in potassium-doped observed elsewhere might have an origin from the electronic correlation effect with different strengths.

SCI ; EI

英语

其他

National Natural Science Foundation of China[11574128]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000380590600052

AMER CHEMICAL SOC

20163102660415

Correlation detectors ; Electronic properties ; Phase separation ; Potassium ; Scanning tunneling microscopy ; Semiconductor doping

Alkali Metals:549.1 ; Semiconducting Materials:712.1 ; Chemical Reactions:802.2 ; Chemical Operations:802.3

Web of Science

1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

Wu, Xuefeng,Xu, Chaoqiang,Wang, Kedong,et al. Charge Transfer, Phase Separation, and Mott-Hubbard Transition in Potassium-Doped Coronene Films[J]. Journal of Physical Chemistry C,2016,120(28):15446-15452.

Wu, Xuefeng,Xu, Chaoqiang,Wang, Kedong,&Xiao, Xudong.(2016).Charge Transfer, Phase Separation, and Mott-Hubbard Transition in Potassium-Doped Coronene Films.Journal of Physical Chemistry C,120(28),15446-15452.

Wu, Xuefeng,et al."Charge Transfer, Phase Separation, and Mott-Hubbard Transition in Potassium-Doped Coronene Films".Journal of Physical Chemistry C 120.28(2016):15446-15452.