Experimental detection of surface spin-polarized electron accumulation in topological insulators using scanning tunneling microscopy Article Swipe

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S. Tyagi , Michael Dreyer , David Bowen , Dan Hinkel , Patrick J. Taylor , Adam L. Friedman , Robert Butera , C. Krafft , I.D. Mayergoyz ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2004.03563

Spin-momentum locking in the surface mode of topological insulators (TI) leads to the surface accumulation of spin-polarized electrons caused by bias current flows through TI samples. Here, we demonstrate that scanning tunneling microscopy can be used to sense this surface spin-polarized electron accumulation. We present experimental results of this sensing for Sn-doped Bi$_2$Se$_3$ samples by employing Fe-coated W tips as well as non-magnetic W tips. We observe a linear increase in the spin-accumulation as a function of bias current through TI samples.

Related Topics

Condensed Matter Physics

Spin (Aerodynamics)

Electron

Scanning Electron Microscope

Concepts

Topological insulator Scanning tunneling microscope Condensed matter physics Spin polarized scanning tunneling microscopy Spin (aerodynamics) Quantum tunnelling Surface (topology) Electron Scanning electron microscope Materials science Scanning tunneling spectroscopy Physics Nanotechnology Optics Quantum mechanics Geometry Thermodynamics Mathematics

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2004.03563
PDF: https://arxiv.org/pdf/2004.03563
OA Status: green
Related Works: 10
OpenAlex ID: https://openalex.org/W3015413596

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DOI: https://doi.org/10.48550/arxiv.2004.03563

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Title: Experimental detection of surface spin-polarized electron accumulation in topological insulators using scanning tunneling microscopy

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Type: preprint

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Language: en

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Publication year: 2020

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Publication date: 2020-04-07

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Authors: S. Tyagi, Michael Dreyer, David Bowen, Dan Hinkel, Patrick J. Taylor, Adam L. Friedman, Robert Butera, C. Krafft, I.D. Mayergoyz

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Landing page: https://arxiv.org/abs/2004.03563

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Concepts: Topological insulator, Scanning tunneling microscope, Condensed matter physics, Spin polarized scanning tunneling microscopy, Spin (aerodynamics), Quantum tunnelling, Surface (topology), Electron, Scanning electron microscope, Materials science, Scanning tunneling spectroscopy, Physics, Nanotechnology, Optics, Quantum mechanics, Geometry, Thermodynamics, Mathematics

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