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arXiv 2402.04724cond-mat.mes-hall
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表面声波与量子反常效应的相互作用

Interaction between Surface Acoustic Wave and Quantum Hall Effects

International Center for Quantum Materials, Peking University(北京大学量子材料国际中心);Center for Excellence, University of Chinese Academy of Sciences(中国科学院大学卓越创新中心);Hefei National Laboratory(合肥国家实验室);Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University(北京大学轻元素量子材料交叉研究所及轻元素先进材料研究中心)

Xiao Liu, Mengmeng Wu, Renfei Wang, Xinghao Wang, Wenfeng Zhang, Yujiang Dong, Rui-Rui Du, Yang Liu, Xi Lin

AI总结:

本研究通过低功率表面声波探索量子反常效应,发现其衰减异常与传统模型不符。

摘要:

表面声波(SAW)是一种用于研究二维电子系统中量子相的有力技术。电子通过屏蔽响应于SAW的压电场,减弱其振幅并改变其速度,这由松弛模型描述。在本工作中,我们系统地研究了这种相互作用,使用比先前研究低几个数量级的SAW振幅。在高磁场下,当电子形成高度相关的状态如量子反常效应时,我们观察到SAW异常大的衰减,而声速仍保持相对较高,这与传统松弛模型不一致。这种异常现象仅在SAW功率足够低时存在。

英文摘要:

Surface Acoustic Wave (SAW) is a powerful technique for investigating quantum phases appearing in two-dimensional electron systems. The electrons respond to the piezoelectric field of SAWthrough screening, attenuating its amplitude and shifting its velocity, which is described by the relaxation model. In this work, we systematically study this interaction using orders of magnitude lower SAW amplitude than that in previous studies. At high magnetic fields when electrons form highly correlated states such as the quantum Hall effect, we observe an anomalously large attenuation of SAW while the acoustic speed remains considerably high, inconsistent with the conventional relaxation model. This anomaly exists only when the SAW power is sufficiently low.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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