Quantum dynamics of hard-core bosons in tilted bichromatic optical lattices

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	Quantum dynamics of hard-core bosons in tilted bichromatic optical lattices
	Cai, XM ; Chen, S ; Wang, YP
刊名	PHYSICAL REVIEW A
	2011
卷号	84 期号:3
关键词	BLOCH-ZENER OSCILLATIONS TONKS-GIRARDEAU GAS ATOMS ARRAYS
ISSN号	1050-2947
通讯作者	Cai, XM (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	Polycrystalline samples of the perovskite family Sr1-xCaxCrO3 have been prepared at high pressure and temperature in steps of 1/6 over the range 0 <= x <= 1. Rietveld analysis shows a series of structural phase transitions from cubic to tetragonal to orthorhombic with increasing x. The cubic samples have no long-range magnetic order; the other samples become antiferromagnetically ordered below a T-N that increases with x. At ambient pressure, the electric transport properties of the cubic and tetragonal phases are semiconducting with a small (meV range) activation energy that increases with x; the orthorhombic phase exhibits variable-range hopping rather than the small-polaron behavior typically found for mixed-valent, localized-electron configurations. Above a pressure P = P-C, a smooth insulator-metal transition is found at a T-IM that decreases with increasing P for a fixed x; P-C increases with x. These phenomena are rationalized qualitatively with a pi*-band model having a width W-pi that approaches crossover from itinerant-electron to localized-electron behavior as W-pi decreases with increasing x. The smaller size of the Ca2+ ion induces the structural changes and the greater acidity of the Ca2+ ion is primarily responsible for narrowing W-pi as x increases.
收录类别	SCI
资助信息	NSF of China [10821403, 10974234]; Chinese Academy of Science; MOST
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/311004/51668]
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	Cai, XM,Chen, S,Wang, YP. Quantum dynamics of hard-core bosons in tilted bichromatic optical lattices[J]. PHYSICAL REVIEW A,2011,84(3).
APA	Cai, XM,Chen, S,&Wang, YP.(2011).Quantum dynamics of hard-core bosons in tilted bichromatic optical lattices.PHYSICAL REVIEW A,84(3).
MLA	Cai, XM,et al."Quantum dynamics of hard-core bosons in tilted bichromatic optical lattices".PHYSICAL REVIEW A 84.3(2011).