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Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve, and universal reversible logic gate

Journal Article


Abstract


  • Despite much anticipation of valleytronics as a candidate to replace the aging complementary metal-oxide-semiconductor (CMOS) based information processing, its progress is severely hindered by the lack of practical ways to manipulate valley polarization all electrically in an electrostatic setting. Here, we propose a class of all-electric-controlled valley filter, valve, and logic gate based on the valley-contrasting transport in a merging Dirac cones system. The central mechanism of these devices lies on the pseudospin-assisted quantum tunneling which effectively quenches the transport of one valley when its pseudospin configuration mismatches that of a gate-controlled scattering region. The valley polarization can be abruptly switched into different states and remains stable over semi-infinite gate-voltage windows. Colossal tunneling valley-pseudomagnetoresistance ratio of over 10000% can be achieved in a valley-valve setup. We further propose a valleytronic-based logic gate capable of covering all 16 types of two-input Boolean logics. Remarkably, the valley degree of freedom can be harnessed to resurrect logical reversibility in two-input universal Boolean gate. The (2+1) polarization states (two distinct valleys plus a null polarization) reestablish one-to-one input-to-output mapping, a crucial requirement for logical reversibility, and significantly reduce the complexity of reversible circuits. Our results suggest that the synergy of valleytronics and digital logics may provide new paradigms for valleytronic-based information processing and reversible computing.

Authors


  •   Ang, Yee Sin S. (external author)
  •   Yang, Shengyuan (external author)
  •   Chao Zhang
  •   Ma, Zhongshui (external author)
  •   Ang, Lawrence K. (external author)

Publication Date


  • 2017

Citation


  • Ang, Y., Yang, S. A., Zhang, C., Ma, Z. & Ang, L. K. (2017). Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve, and universal reversible logic gate. Physical Review B: Covering condensed matter and materials physics, 96 (24), 245410-1-245410-13.

Scopus Eid


  • 2-s2.0-85039454300

Start Page


  • 245410-1

End Page


  • 245410-13

Volume


  • 96

Issue


  • 24

Place Of Publication


  • United States

Abstract


  • Despite much anticipation of valleytronics as a candidate to replace the aging complementary metal-oxide-semiconductor (CMOS) based information processing, its progress is severely hindered by the lack of practical ways to manipulate valley polarization all electrically in an electrostatic setting. Here, we propose a class of all-electric-controlled valley filter, valve, and logic gate based on the valley-contrasting transport in a merging Dirac cones system. The central mechanism of these devices lies on the pseudospin-assisted quantum tunneling which effectively quenches the transport of one valley when its pseudospin configuration mismatches that of a gate-controlled scattering region. The valley polarization can be abruptly switched into different states and remains stable over semi-infinite gate-voltage windows. Colossal tunneling valley-pseudomagnetoresistance ratio of over 10000% can be achieved in a valley-valve setup. We further propose a valleytronic-based logic gate capable of covering all 16 types of two-input Boolean logics. Remarkably, the valley degree of freedom can be harnessed to resurrect logical reversibility in two-input universal Boolean gate. The (2+1) polarization states (two distinct valleys plus a null polarization) reestablish one-to-one input-to-output mapping, a crucial requirement for logical reversibility, and significantly reduce the complexity of reversible circuits. Our results suggest that the synergy of valleytronics and digital logics may provide new paradigms for valleytronic-based information processing and reversible computing.

Authors


  •   Ang, Yee Sin S. (external author)
  •   Yang, Shengyuan (external author)
  •   Chao Zhang
  •   Ma, Zhongshui (external author)
  •   Ang, Lawrence K. (external author)

Publication Date


  • 2017

Citation


  • Ang, Y., Yang, S. A., Zhang, C., Ma, Z. & Ang, L. K. (2017). Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve, and universal reversible logic gate. Physical Review B: Covering condensed matter and materials physics, 96 (24), 245410-1-245410-13.

Scopus Eid


  • 2-s2.0-85039454300

Start Page


  • 245410-1

End Page


  • 245410-13

Volume


  • 96

Issue


  • 24

Place Of Publication


  • United States