Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly

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	Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly
	Liu, L ; Niu, JS ; Xiang, L ; Wei, J ; Li, DL ; Feng, JF ; Han, XF ; Zhang, XG ; Coey, JMD
刊名	PHYSICAL REVIEW B
	2014
卷号	90 期号:19
ISSN号	1098-0121
通讯作者	Liu, L (reprint author), Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China.
中文摘要	We provide conclusive experimental evidence that zero-bias anomaly in the differential resistance of magnetic tunnel junctions is due to electron-electron interaction (EEI), clarifying a longstanding issue. The magnon effect that caused confusion is now excluded by measuring at low temperatures down to 0.2 K and with reduced ac measurement voltages down to 0.06 mV. The normalized change of conductance is proportional to ln (eV/k(B)T), consistent with the Altshuler-Aronov theory of tunneling that describes the reduction of density of states due to EEI, but inconsistent with magnetic impurity scattering. The slope of the ln (eV/k(B)T) dependence is symmetry dependent: the slopes for parallel and antiparallel states are different for coherent tunnel junctions with symmetry filtering, while nearly the same for those without symmetry filtering (amorphous barriers). This observation may be helpful for verifying symmetry-preserved filtering in search of new coherent tunneling junctions, and for probing and separating electron Bloch states of different symmetries in other correlated systems.
资助信息	National Basic Research Program of China (973 Program) [2011CBA00106, 2012CB927400]; State Key Project of Fundamental Research of Ministry of Science and Technology [MOST] [2010CB934401, 2014AA032904]; National Natural Science Foundation of China [NSFC] [11434014]; Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59496]
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	Liu, L,Niu, JS,Xiang, L,et al. Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly[J]. PHYSICAL REVIEW B,2014,90(19).
APA	Liu, L.,Niu, JS.,Xiang, L.,Wei, J.,Li, DL.,...&Coey, JMD.(2014).Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly.PHYSICAL REVIEW B,90(19).
MLA	Liu, L,et al."Symmetry-dependent electron-electron interaction in coherent tunnel junctions resolved by measurements of zero-bias anomaly".PHYSICAL REVIEW B 90.19(2014).