一个量子威格纳固体的移动晶相在一个超高质量的二维电子系统中
P T Madathil1, K A Villegas Rosales1, Y J Chung1
1Department of Electrical and Computer Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Physical review letters
|December 22, 2023
概括
在超低调的二维电子系统中,维格纳固体相表现出三种不同的动态相. 这些相以非线性电流-电压和噪声行为为特征,表明电子固体中的新型电流驱动动力学.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子霍尔效应是一种量子霍尔效应.
- 低维电子系统 低维电子系统
背景情况:
- 在二维电子系统 (2DESs) 中的分量量子霍尔状态在低兰道水平填充下过渡到维格纳固体 (WS) 阶段.
- 维格纳固体通常表现出绝缘性行为,由于被混乱固定,显示非线性电流-电压 (I-V) 和噪声特征.
研究的目的:
- 在超低乱2DES中研究维格纳固体的动态相.
- 将WS的非线性I-V和噪声行为描述为增加电流的函数.
主要方法:
- 在稀释的2DES上进行测量,仅限于具有异常低扰乱的GaAs量子井.
- 分析纵向电阻,非线性I-V特征和噪声光谱在低兰道水平填充 (ν < 1/5),包括发展 ν = 1/7 分数量子霍尔状态.
主要成果:
- 观察到3个不同的动态阶段 (P1,P2,P3) 的维格纳固体与不断增加的电流.
- 阶段P1:固定,低噪音. 阶段P2:负差电阻,高噪声. 阶段P3:低差分电阻,中等噪声.
- 深化阶段 (P2,P3) 显示噪声光谱,峰值与电流线性变化,表明洗衣板频率.
结论:
- 这项研究揭示了驱动维格纳固体中明显的动态相,挑战了简单的固定状态的概念.
- 观察到的现象与在驱动维格纳固体中提出动态相变的理论一致.
- 2DES的高质量使得微妙的维格纳固体动力学和微量量子霍尔态的观测成为可能.
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