Electric field-tuned unconventional superconductivity in nanoelectronic devices

纳米电子器件中电场调节的非常规超导性

• 批准号: 2485664
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2485664
• 关键词: Electric; field; tuned; unconventional; superconductivity

The quantum critical ferroelectrics SrTiO3 and KTaO3 are usually band insulators but can be transformed into metals by introducing electron charge carriers using ionic-liquid voltage gates. Metallicity can be switched on and off by the simple application of a few volts and IBM have a programme to fabricate vast arrays of SrTiO3-based micro-transistors. Gated SrTiO3 and KTaO3 become superconducting below 1K with a dome of superconductivity in the temperature carrier-density phase diagram. A recent theory has unlocked the mystery of how such materials become superconductors which points to the role of hybrid polar modes in creating electron pairing states. This insight allows us to anticipate superconductivity in a range of new materials. The PhD project builds on the work and skills ascertained in the midi project to identify candidate anti-ferroelectrics that may be doped with electrons and tuned to quantum critical points. Epitaxial thin-film perovskites with varying chemical compositions will be prepared using pulsed-laser deposition. Nanoelectronic devices will be fabricated appropriate for ionic-liquid gating experiments. mK refrigerators will be used to search for unconventional superconductivity, perhaps with enhanced transition temperatures, and to investigate the electrical properties of the novel metallic state and the insulator-metal transition.

量子临界铁电srtio3和ktao3通常是条带绝缘子，但可以通过使用离子液压电压引入电子荷载体来转化为金属。可以通过简单地应用几伏和IBM的程序来打开和关闭金属​​性，以制造大量基于SRTIO3的微型传播器的程序。在温度载体密度相图中，门控SRTIO3和KTAO3在1K以下具有超过1K的超导。最近的理论解锁了这种材料如何成为超导体的奥秘，这表明了混合极性模式在创建电子配对状态中的作用。这种见解使我们能够预测一系列新材料中的超导性。博士项目建立在MIDI项目中确定的工作和技能的基础上，以识别可能用电子掺杂并调整为量子关键点的候选抗弗罗伊电信。将使用脉冲激光沉积制备具有不同化学成分的外延薄膜钙钛矿。纳米电子设备将被制造适合离子液体门控实验。 MK冰箱将用于寻找非常规的超导性，也许具有增强的过渡温度，并研究新型金属状态的电特性和绝缘剂 - 金属过渡。