量子材料聚焦:KTaO3二维界面超导

doi:10.12066/j.issn.1007-2861.2582

摘要/Abstract

摘要： 钙钛矿氧化物异质界面中二维电子气(two-dimensionalelectron gas,2DEG)与界面超导性的发现使其成为研究热点之一.近年来,氧化物界面研究取得突破性进展,除了传统的LaAlO$_{3}$/SrTiO$_{3}$(LAO/STO)界面,2021年在KTaO$_{3}$(KTO)界面也发现超导性,其超导转变温度($T_{\rm c}$)较LAO/STO高出一个数量级,约为2 K,引起广泛关注.与STO界面体系相比,KTO氧化物界面显现出高载流子迁移率、强自旋轨道耦合(spin-orbit coupling,SOC)等特点,为理解非常规超导机制和构建新物理特性的研究提供了新途径,使KTO异质界面成为未来电子和自旋电子应用的有力候选者.本文旨在总结近5年KTO界面的最新进展,概述多种氧化物与KTO界面超导的新奇物理现象,并讨论目前研究中尚未解决的问题,为未来研究提供参考.

关键词: 氧化物异质界面, 非常规超导, 二维电子气, 自旋轨道耦合, 量子材料, 器件应用

Abstract: The discovery of two-dimensional electron gas (2DEG) and interfacial superconductivity within perovskite oxide heterostructures has made them one of the research hotspots. In recent years, there have been groundbreaking advancements in the study of oxide interfaces. In addition to the conventional LaAlO$_{3}$/SrTiO$_{3}$ (LAO/STO) interface, superconductivity has been observed at the KTaO$_{3}$ (KTO) interface in 2021, with a superconducting transition temperature ($T_{\rm c}$) approximately an order of magnitude higher than that of LAO/STO, reaching around 2 K, sparking widespread attention. Compared to the STO interface system, the KTO oxide interface exhibits characteristics such as high carrier mobility and strong spin-orbit coupling (SOC), providing a new avenue for understanding the mechanism of unconventional superconductivity and studying new physical properties, thus establishing KTO heterostructures as promising candidates for future electronic and spintronic applications. This paper aims to summarize the latest progress in KTO interfaces over the past five years, provide an in-depth overview of the novel physical phenomena of superconductivity at the interfaces of various oxides and KTO, and discuss unresolved issues in current researches, thereby guiding the direction of future investigations.

Key words: oxide heterointerfaces, unconventional superconductivity, two-dimensional electron gas, spin-orbit coupling, quantum material, application device

中图分类号:

O469

尹鑫茂, 孙孟霞, 宁苑杰, 代靓, 李敏娟, 蔡传兵. 量子材料聚焦:KTaO₃二维界面超导[J]. 上海大学学报(自然科学版), 2025, 31(4): 591-606.

YIN Xinmao, SUN Mengxia, NING Yuanjie, DAI Liang, LI Minjuan, CAI Chuanbing. Focus on quantum materials: KTaO₃ two-dimensional interface superconductivity[J]. Journal of Shanghai University（Natural Science Edition）, 2025, 31(4): 591-606.

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量子材料聚焦:KTaO₃二维界面超导

Focus on quantum materials: KTaO₃ two-dimensional interface superconductivity

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