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

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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number7875
Number of pages14
JournalScientific Reports
Volume10
Issue number1
DOIs
Publication statusPublished - 12 May 2020

Keywords

  • SCATTERING

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