Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film

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	Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film
	Jiang, H ; Qiao, ZH ; Liu, HW ; Niu, Q
刊名	PHYSICAL REVIEW B
	2012
卷号	85 期号:4
关键词	SINGLE DIRAC CONE PHASE-TRANSITION SURFACE REALIZATION BI2TE3 WELLS
ISSN号	1098-0121
通讯作者	Jiang, H (reprint author), Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China.
中文摘要	In order to study the interaction between molecules and photon fields, including plasmonic and external laser fields, we have carried out in situ measurements of photoluminescence (PL) from porphyrin molecules on Au substrates with and without a scanning tunneling microscope (STM) tip. Measurements were performed in a ultra-high vacuum scanning tunneling microscope chamber during irradiation by a He-Cd laser with incident power varying in the 10(-3) to 10(-7) W range. At an incident power of around 10(-7) W, the spectra depend strongly on the presence of STM tip, which is associated with STM light emission from molecules. We estimated the ratio of quantum efficiency of scanning tunneling microscope-induced light emission (STML) from molecules to PL on the basis of the STML/PL intensity ratio observed experimentally at a laser power of 7.5 x 10(-8) W, with the use of a 40 mu m laser beam diameter and an effective area of 2 nm for STML. The estimated quantum efficiency for an electron in STML is roughly 10(10) times larger than that for one photon of PL. This anomalous enhancement will be discussed on the basis of plasmon-enhanced light emission from molecules in a STM nano-cavity. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3680597]
收录类别	SCI
资助信息	China Postdoctroal Science Foundation [20100480147, 201104030]; Peking University; NSF [DMR 0906025]; Welch Foundation [F-1255]; DOE (Division of Materials Science and Engineering) [DE-FG03-02ER45958]; Texas Advanced Research Program
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51641]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Jiang, H,Qiao, ZH,Liu, HW,et al. Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film[J]. PHYSICAL REVIEW B,2012,85(4).
APA	Jiang, H,Qiao, ZH,Liu, HW,&Niu, Q.(2012).Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film.PHYSICAL REVIEW B,85(4).
MLA	Jiang, H,et al."Quantum anomalous Hall effect with tunable Chern number in magnetic topological insulator film".PHYSICAL REVIEW B 85.4(2012).