在UTe2中检测对密度波状态
Qiangqiang Gu1, Joseph P Carroll1,2, Shuqiu Wang3,4
1LASSP, Department of Physics, Cornell University, Ithaca, NY, USA.
Nature
|June 28, 2023
概括
研究人员在拓超导体UTe2中发现了前所未有的三旋对密度波 (PDW). 这些PDW与电荷密度波 (CDW) 并存,为量子信息处理提供了新的途径.
科学领域:
- 凝聚物质物理学
- 量子材料
- 超导性
背景情况:
- 对于量子信息来说具有独特的电子特性.
- UTe2是拓超导的候选者,但其顺序参数和潜在的共存相仍然不清楚.
- 交织密度波,包括电荷密度波 (CDW) 和对密度波 (PDW),可以影响超导状态.
研究的目的:
- 调查UTe2中对密度波 (PDW) 状态的潜在存在.
- 用高能量分辨率可视化和描述UTe2中的配对能量差距.
- 了解UTe2中新发现的CDW状态和潜在的PDW状态之间的关系.
主要方法:
- 使用超导扫描道显微镜 (STM) 的微电子电压 (μeV) 能量分辨率.
- 对配对能量差距进行可视化,以检测PDW的空间调制.
- 同时成像PDW和CDW状态以分析它们的空间关系和相位.
主要成果:
- 在UTe2中检测到三个不同的PDW状态,每个PDW状态的调制大约为10μeV.
- 观察到的PDW的波向量 (Pi) 与现有CDW状态的波向量 (Qi) 无法区分.
- 在PDW (Pi) 和CDW (Qi) 状态之间观察到一个约为π的空间相位转移.
结论:
- 在UTe2中观察到的PDW状态被确定为自旋三重体PDW,与UTe2作为自旋三重体超导体的性质一致.
- 这一发现代表了在超导体中首次观察到自旋三重体的PDW状态,与其存在于超流体3He不同.
- 这些发现为探索外来电子状态及其在量子信息处理中的应用开辟了新的可能性.
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