Impact of DNA Twist Accumulation on Progressive Helical Wrapping of Torsionally Constrained DNA

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	Impact of DNA Twist Accumulation on Progressive Helical Wrapping of Torsionally Constrained DNA
	Li, W ; Wang, PY ; Yan, J ; Li, M
刊名	PHYSICAL REVIEW LETTERS
	2012
卷号	109 期号:21
关键词	TORQUE MEASUREMENTS FINE-STRUCTURE MOLECULES ELASTICITY NUCLEOSOME DYNAMICS TENSION TRANSITIONS COMPACTION RESOLUTION
ISSN号	0031-9007
通讯作者	Li, W: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We present optical spectroscopy measurements on rare-earth ditelluride single crystals of LaTe1.95 and CeTe1.95-xSex (x = 0 and 0.16). The measurements reveal formation of charge-density-wave energy gaps at rather high-energy levels, for example, 2 Delta similar to 8500 cm(-1) for LaTe1.95 and 6800 cm(-1) for CeTe1.95. More strikingly, the study reveals that, different from the rare-earth tritellurides, the Te vacancies and disorder effect play a key role in the low-energy charge excitations of ditelluride systems. Although an eminent peak is observed between 800 and 1500 cm(-1) in conductivity spectra for LaTe1.95, and CeTe1.95-xSex (x = 0 and 0.16), our analysis indicates that it could not be attributed to the formation of a small energy gap, instead it could be well accounted for by the localization modified Drude model. Our study also indicates that the low-temperature optical spectroscopic features are distinctly different from a semiconducting charge-density-wave (CDW) state with entirely gapped Fermi surfaces.
收录类别	SCI
资助信息	National Nature Science Foundation of China [11104341, 10927402, 10834014]; National Basic Research Program of China [2009CB930704]; Mechanobiology Institute at National University of Singapore
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/39626]
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	Li, W,Wang, PY,Yan, J,et al. Impact of DNA Twist Accumulation on Progressive Helical Wrapping of Torsionally Constrained DNA[J]. PHYSICAL REVIEW LETTERS,2012,109(21).
APA	Li, W,Wang, PY,Yan, J,&Li, M.(2012).Impact of DNA Twist Accumulation on Progressive Helical Wrapping of Torsionally Constrained DNA.PHYSICAL REVIEW LETTERS,109(21).
MLA	Li, W,et al."Impact of DNA Twist Accumulation on Progressive Helical Wrapping of Torsionally Constrained DNA".PHYSICAL REVIEW LETTERS 109.21(2012).