摘要
Surface acoustic wave(SAW)is a powerful technique for investigating quantum phases appearing in twodimensional electron systems.The electrons respond to the piezoelectric field of SAW through 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 those 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.
作者
刘萧
吴蒙蒙
王任飞
王兴豪
张文锋
董昱江
杜瑞瑞
刘阳
林熙
Xiao Liu;Mengmeng Wu;Renfei Wang;Xinghao Wang;Wenfeng Zhang;Yujiang Dong;Rui-Rui Du;Yang Liu;Xi Lin(International Center for Quantum Materials,Peking University,Beijing 100871,China;Center for Excellence,University of Chinese Academy of Sciences,Beijing 100190,China;Hefei National Laboratory,Hefei 230088,China;Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials,Peking University,Beijing 100871,China)
基金
supported by the National Key Research and Development Program of China(Grant Nos.2021YFA1401900 and 2019YFA0308403)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33030000)
the National Natural Science Foundation of China(Grant Nos.92065104,12074010,and 12141001)
the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302602)for sample fabrication and measurement。
