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Electrically controlled spin polarized current in Dirac semimetals.

Qianqian Lv1,2,3, Pei-Hao Fu1,2,3, Xiang-Long Yu2,3

  • 1Department of Physics, Harbin Institute of Technology, Harbin, 150001, China.

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|November 3, 2021
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Summary
This summary is machine-generated.

Researchers demonstrate a tunable spin-polarized current in Dirac semimetal devices. Electrical control over gate voltage, chemical potential, and coupling strength offers a novel spintronic approach.

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Materials science

Background:

  • Dirac semimetals (DSMs) exhibit unique electronic properties crucial for advanced electronic devices.
  • Spintronic devices offer potential for lower power consumption and higher speeds compared to conventional electronics.
  • Controlling spin-polarized currents is key to developing next-generation spintronic technologies.

Purpose of the Study:

  • To propose a novel spintronic device design utilizing a Dirac semimetal.
  • To demonstrate the generation of a highly tunable spin-polarized current.
  • To show that electrical parameters can control the spin-polarized current.

Main Methods:

  • Theoretical proposal of a spintronic device based on a Dirac semimetal.
  • Utilizing gate voltage to control the density of states near Dirac nodes.
  • Employing magnetic fields to manipulate Weyl nodes and surface Fermi arcs.
  • Adjusting chemical potential and lead-DSM coupling strength to tune the current.

Main Results:

  • A highly tunable spin-polarized current can be generated in the proposed DSM-based device.
  • Gate voltage, chemical potential, and coupling strength effectively control the spin polarization.
  • The semimetallic nature, Zeeman field-induced Weyl nodes, and surface Fermi arcs are key to achieving this control.
  • The proposed device is expected to be experimentally realizable.

Conclusions:

  • The study presents a viable method for generating tunable spin-polarized currents using Dirac semimetals.
  • Electrical control offers a practical and efficient way to manipulate spin currents in spintronic devices.
  • This work paves the way for new spintronic applications leveraging the unique properties of Dirac semimetals.