阶段工程安德里耶夫带结构的三个终端的约瑟夫森交叉点
Marco Coraiola1, Daniel Z Haxell1, Deividas Sabonis1
1IBM Research Europe-Zurich, 8803, Rüschlikon, Switzerland.
Nature communications
|October 25, 2023
概括
研究人员使用混合材料在三终端约瑟夫森连接处创建了一个新的"安德列夫分子". 这种工程系统展示了可调节的安德里耶夫结合状态和合成带结构,为新的量子现象铺平了道路.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 超导电性 超导电性 超导电性
背景情况:
- 混合约瑟夫森结使得安德里耶夫结合状态的研究成为可能.
- 控制超导相位差可以设计非传统的能量带结构,称为安德里耶夫物质.
- 多终端几何学为新的量子现象提供了丰富的可能性.
研究的目的:
- 实验实现和研究一个阶段控制的安德里耶夫分子在一个三终端约瑟夫森结.
- 通过控制超导相差来探索合成安德列夫带结构的形成.
- 为了证明离散的安德里耶夫水平的混合.
主要方法:
- 使用InAs/Al异构结构制造一个三终端的约瑟夫森连接点.
- 使用道谱法来测量能量频谱.
- 在两个循环中独立控制两个超导相差.
- 采用数值模型进行理论解释.
主要成果:
- 通过混合两个离散的安德里耶夫水平形成的相控安德里耶夫分子的演示.
- 观察杂交的特征,包括在能量频谱中避免交叉.
- 在二维相位空间中的带结构异构的表征.
- 使用数值模型成功解释实验结果.
结论:
- 这项研究成功地展示了在多终端混合Josephson连接中控制相位的Andreev分子的概念.
- 这些发现通过精确控制超导相验证了合成安德里耶夫带结构的工程.
- 这项工作为未来的研究开辟了道路,研究了复杂超导几何结构中的自旋解析能量水平,费米子平价过渡和韦尔波段.
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