Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device

Sadi, Mohammad Abdullah; Gupta, Gaurav; Liang, Gengchiau

doi:10.1063/1.4898357

Title: Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device

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Abstract

The effect of phase-transition from the quantum-spin-hall to the band-insulator phase on the transport through a three-terminal U-shape spin-separator has been computationally investigated via non-equilibrium green function formalism. Two-dimensional group-IV elements have been comprehensively appraised as the device material. The device separates the unpolarized current injected at the source-terminal into nearly 100% spin-polarized currents of the opposite polarities at the two drain terminals. The phase-transition activated by the electric-field orthogonal to the device is shown to extensively influence the current magnitude and its spin-polarization, and the effect is stronger for materials with smaller intrinsic spin-orbit coupling. Moreover, the device length and the area under field are shown to critically affect the device characteristics on phase change. It is shown that the same device can be operated as a spin-filter by inducing phase-transition selectively in the channel. The results are important for designing spin-devices from Group-IV monolayers.

Authors:

Sadi, Mohammad Abdullah; Gupta, Gaurav; Liang, Gengchiau ^[1]

Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore)

Publication Date:: Tue Oct 21 00:00:00 EDT 2014

OSTI Identifier:: 22305827

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 116; Journal Issue: 15; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRIC FIELDS; EQUILIBRIUM; GREEN FUNCTION; L-S COUPLING; PHASE TRANSFORMATIONS; SPIN; SPIN ORIENTATION; TWO-DIMENSIONAL CALCULATIONS

Citation Formats


                    Sadi, Mohammad Abdullah, Gupta, Gaurav, and Liang, Gengchiau. Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4898357.

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                    Sadi, Mohammad Abdullah, Gupta, Gaurav, & Liang, Gengchiau. Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device.  United States.  https://doi.org/10.1063/1.4898357

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                    Sadi, Mohammad Abdullah, Gupta, Gaurav, and Liang, Gengchiau. 2014.  
        "Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device".  United States.  https://doi.org/10.1063/1.4898357.

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@article{osti_22305827,

  title        = {Effect of phase transition on quantum transport in group-IV two-dimensional U-shape device},

  author       = {Sadi, Mohammad Abdullah and Gupta, Gaurav and Liang, Gengchiau},

  abstractNote = {The effect of phase-transition from the quantum-spin-hall to the band-insulator phase on the transport through a three-terminal U-shape spin-separator has been computationally investigated via non-equilibrium green function formalism. Two-dimensional group-IV elements have been comprehensively appraised as the device material. The device separates the unpolarized current injected at the source-terminal into nearly 100% spin-polarized currents of the opposite polarities at the two drain terminals. The phase-transition activated by the electric-field orthogonal to the device is shown to extensively influence the current magnitude and its spin-polarization, and the effect is stronger for materials with smaller intrinsic spin-orbit coupling. Moreover, the device length and the area under field are shown to critically affect the device characteristics on phase change. It is shown that the same device can be operated as a spin-filter by inducing phase-transition selectively in the channel. The results are important for designing spin-devices from Group-IV monolayers.},

  doi          = {10.1063/1.4898357},

  url          = {https://www.osti.gov/biblio/22305827},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 15,

  volume       = 116,

  place        = {United States},

  year         = {Tue Oct 21 00:00:00 EDT 2014},

  month        = {Tue Oct 21 00:00:00 EDT 2014}

}

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