Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO3

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	Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO3
	Meevasana, W ; Zhou, XJ ; Moritz, B ; Chen, CC ; He, RH ; Fujimori, SI ; Lu, DH ; Mo, SK ; Moore, RG ; Baumberger, F ; Devereaux, TP ; van der Marel, D ; Nagaosa, N ; Zaanen, J ; Shen, ZX
刊名	NEW JOURNAL OF PHYSICS
	2010
卷号	12
关键词	FERMI-SURFACE SUPERCONDUCTIVITY LA2-XSRXCUO4 TRANSITIONS MANGANITES BIPOLARONS OXIDES
ISSN号	1367-2630
通讯作者	Meevasana, W (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
中文摘要	Much progress has been made recently in the study of the effects of electron-phonon (el-ph) coupling in doped insulators using angle-resolved photoemission (ARPES), yielding evidence for the dominant role of el-ph interactions in underdoped cuprates. As these studies have been limited to doped Mott insulators, the important question arises as to how this compares with doped band insulators where similar el-ph couplings should be at work. The archetypical case is that of perovskite SrTiO3 (STO), well known for its giant dielectric constant of 10 000 at low temperatures, exceeding that of La2CuO4 by a factor of 500. Based on this fact, it has been suggested that doped STO should be the archetypical bipolaron superconductor. Here we report an ARPES study from high-quality surfaces of lightly doped STO. In comparison to lightly doped Mott insulators, we find the signatures of only moderate el-ph coupling; a dispersion anomaly associated with the low-frequency optical phonon with a lambda' similar to 0.3 and an overall bandwidth renormalization suggesting an overall lambda' similar to 0.7 coming from the higher frequency phonons. Furthermore, we find no clear signatures of the large pseudogap or small-polaron phenomena. These findings demonstrate that a large dielectric constant itself is not a good indicator of el-ph coupling and highlight the unusually strong effects of the el-ph coupling in doped Mott insulators.
收录类别	SCI
资助信息	Department of Energy [DE-AC02-76SF00515]; Thailand Research Fund; National Science Council, Taiwan [NSC-095-SAF-I-564-013-TMS]
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/311004/53155]
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	Meevasana, W,Zhou, XJ,Moritz, B,et al. Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO3[J]. NEW JOURNAL OF PHYSICS,2010,12.
APA	Meevasana, W.,Zhou, XJ.,Moritz, B.,Chen, CC.,He, RH.,...&Shen, ZX.(2010).Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO3.NEW JOURNAL OF PHYSICS,12.
MLA	Meevasana, W,et al."Strong energy-momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO3".NEW JOURNAL OF PHYSICS 12(2010).