In-plane anisotropy in two-dimensional electron gas at LaAlO3/SrTiO3(110) interface

• 作者: 厉承剑 沈胜春 洪彦鹏 王欣欣 聂家财 薛红霞
• 来源期刊: 中国物理B（英文版）
• 关键词: oxide interfaces two-dimensional electron gas anisotropy
• 年，卷（期）: 2016,（7）
• 页码范围: 076802-1-076802-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/076802

摘要

A systematic study of the two-dimensional electron gas at LaAlO3/SrTiO3(110) interface reveals an anisotropy alongtwo specific directions, [001] and ?1ˉ10?. The anisotropy becomes distinct for the interface prepared under high oxygen pres-sure with low carrier density. Angular dependence of magnetoresistance shows that the electron confinement is strongeralong the ?1 ˉ10? 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 tempera-ture is lower but the upper critical field is higher along the ?1 ˉ10? direction. This in-plane anisotropy could be ascribed to the anisotropic band structure along the two crystallographic directions.