文章基本信息

标题：Anomalous Decay of Quantum Resistance Oscillations of 2D Helical Electrons in Magnetic Field
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作者：S. Abedi ; S. A. Vitkalov ; N. N. Mikhailov 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-14
DOI：10.1038/s41598-020-64385-7
出版社：Springer Nature
摘要：Shubnikov de Haas resistance oscillations of highly mobile two dimensional helical electrons propagating on a conducting surface of strained HgTe 3D topological insulator are studied in magnetic fields B tilted by angle θ from the normal to the conducting layer. Strong decrease of oscillation amplitude A is observed with the tilt: $${\boldsymbol{A}}\sim {\boldsymbol{e}}{\boldsymbol{x}}{\boldsymbol{p}}(\,-\,{\boldsymbol{\xi }}/{\boldsymbol{c}}{\boldsymbol{o}}{\boldsymbol{s}}({\boldsymbol{\theta }}))$$, where ξ is a constant. Evolution of the oscillations with temperature T shows that the parameter $${\boldsymbol{\xi }}$$ contains two terms: $${\boldsymbol{\xi }}={{\boldsymbol{\xi }}}_) {{\boldsymbol{\xi }}}_,{\boldsymbol{T}}$$. The temperature independent term, $${{\boldsymbol{\xi }}}_{{\bf)}}$$, signals possible reduction of electron mean free path $${l}_{q}$$ and/or enhancement of in-homogeneous broadening of the oscillations in magnetic field B. The temperature dependent term, $${{\boldsymbol{\xi }}}_{{\bf,}}{\boldsymbol{T}}$$, indicates increase of the reciprocal velocity of 2D helical electrons: $$\delta ({v}_{F}^{-1})\sim B$$ suggesting modification of the electron spectrum in magnetic fields. Results are found in good agreement with proposed phenomenological model.