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Observation of carrier concentration dependent spintronic terahertz emission from <i>n</i>-GaN/NiFe heterostructures

ORAL

Abstract

The development of terahertz (THz) spintronics has created a paradigm shift in the generation of THz radiation through the combination of ultrafast magnetism and spin-based electronics. However, research in this area has primarily focused on all-metallic devices comprising a ferromagnetic thin film adjacent to a non-magnetic heavy metal. Here, we report the experimental observation of spintronic THz emission from an n-doped wide bandgap semiconductor, n-GaN. We found that the amplitude of THz emission strongly depends on the carrier concentration of the semiconductor layer, which could be attributed to the tunable Rashba state occurring at the n-GaN/ferromagnet interface. Our work offers exciting prospects for pursuing wide bandgap semiconductor-based spintronic THz devices and demonstrating their intriguing spin Hall physics at the ultrafast timescale.

Presenters

  • Eric Vetter

    Materials Science and Engineering, North Carolina State University, Physics, Oakland University

Authors

  • Eric Vetter

    Materials Science and Engineering, North Carolina State University, Physics, Oakland University

  • Melike Biliroglu

    Physics, North Carolina State University

  • Dovletgeldi Seyitliyev

    North Carolina State University, Physics, North Carolina State University

  • Pramod Reddy

    Adroit Materials Inc., 2054 Kildaire Farm Road, Suite 205, Cary, NC 27518, USA, Adroit Materials, Inc.

  • Ronny Kirste

    Adroit Materials, Inc.

  • Zlatko Sitar

    Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA, North Carolina State University, Materials Science and Engineering, North Carolina State University

  • Ramon Collazo

    Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA, North Carolina State University, Materials Science and Engineering, North Carolina State University

  • Kenan Gundogdu

    North Carolina State University, Physics, North Carolina State University

  • Dali Sun

    Physics, North Carolina State University, North Carolina State University