Anomalous Decay of Quantum Resistance Oscillations of 2D Helical Electrons in Magnetic Field

S. Abedi, S. A. Vitkalov, N. N. Mikhailov, Z. D. Kvon

Результат исследования: Научные публикации в периодических изданияхстатья

Аннотация

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: A∼exp(−ξ/cos(θ)), where ξ is a constant. Evolution of the oscillations with temperature T shows that the parameter ξ contains two terms: ξ= ξ1+ ξ2T. The temperature independent term, ξ1, signals possible reduction of electron mean free path lq and/or enhancement of in-homogeneous broadening of the oscillations in magnetic field B. The temperature dependent term, ξ2T, indicates increase of the reciprocal velocity of 2D helical electrons: δ(vF−1)∼B suggesting modification of the electron spectrum in magnetic fields. Results are found in good agreement with proposed phenomenological model.

Язык оригиналаанглийский
Номер статьи7875
Число страниц14
ЖурналScientific Reports
Том10
Номер выпуска1
DOI
СостояниеОпубликовано - 12 мая 2020

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