In-plane anisotropy in two-dimensional electron gas at LaAlO_3/SrTiO_3(110) interface  

作　　者：沈胜春 洪彦鹏 厉承剑 薛红霞 王欣欣 聂家财 

机构地区：[1]Department of Physics, Beijing Normal University

出　　处：《Chinese Physics B》2016年第7期361-366,共6页中国物理B（英文版）

基　　金：Project supported by the Ministry of Science and Technology of China(Grant Nos.2013CB921701,2013CBA01603,and 2014CB920903);the National Natural Science Foundation of China(Grant Nos.10974019,51172029,91121012,11422430,11374035,11474022,and 11474024);the Program for New Century Excellent Talents in the University of the Ministry of Education of China(Grant No.NCET-13-0054);the Beijing Higher Education Young Elite Teacher Project,China(Grant No.YETP0238)

摘　　要：A systematic study of the two-dimensional electron gas at La AlO_3/SrTiO_3（110） interface reveals an anisotropy along two specific directions, [001] and 1ī0. The anisotropy becomes distinct for the interface prepared under high oxygen pressure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is stronger along the 1ī0 direction. Gate-tunable magnetoresistance reveals a clear in-plane anisotropy of the spin–orbit coupling,and the spin relaxation mechanism along both directions belongs to D＇yakonov–Perel＇（DP） scenario. Moreover, in-plane anisotropic superconductivity is observed for the sample with high carrier density, the superconducting transition temperature is lower but the upper critical field is higher along the 1ī0 direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions.A systematic study of the two-dimensional electron gas at La AlO_3/SrTiO_3（110） interface reveals an anisotropy along two specific directions, [001] and 1ī0. The anisotropy becomes distinct for the interface prepared under high oxygen pressure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is stronger along the 1ī0 direction. Gate-tunable magnetoresistance reveals a clear in-plane anisotropy of the spin–orbit coupling,and the spin relaxation mechanism along both directions belongs to D＇yakonov–Perel＇（DP） scenario. Moreover, in-plane anisotropic superconductivity is observed for the sample with high carrier density, the superconducting transition temperature is lower but the upper critical field is higher along the 1ī0 direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions.

关 键 词：oxide interfaces two-dimensional electron gas anisotropy 

分 类 号：O469[理学—凝聚态物理]