A multi-bands Hubbard model of intrinsic long range magnetic order in diluted magnetic semiconductors

ORAL

Abstract

Recently, new long range ferromagnetic order has been discovered both experimentally and theoretically in carrier free semiconductor. However, there lacks quantitative model to explain the coupling mechanism that may extend to 7th nearest neighbors. In this work, we derived a multi-bands Hubbard model to explain the long range mechanism mediated by localized d states. Based on this model and combining with DFT calculations, we discovered a long range AFM order in DMS systems. Our model provides fundamental understandings of the new type of magnetic order in DMS.

*We are grateful for the financial support of Chinese University of Hong Kong (CUHK) (Grant No.4053084), University Grants Committee of Hong Kong (ECS Grant No. 24300814, GRF Grant No. 14319716, GRF Grant No. 14307018), and start-up funding of CUHK.

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Presenters

  • Weiyi Gong

    • Physics, The Chinese University of Hong Kong

Authors

  • Weiyi Gong

    • Physics, The Chinese University of Hong Kong

  • Ching-Him Leung

    • Physics, The Chinese University of Hong Kong

  • Chuen-Keung Sin

    • Physics, The Chinese University of Hong Kong

  • Jingzhao Zhang

    • The Chinese University of Hong Kong
    • Physics, The Chinese University of Hong Kong
    • Physics, The Chinese University of HongKong

  • Xiaodong Zhang

    • Physics, The Chinese University of Hong Kong

  • Bin Xi

    • Physics, The Chinese University of Hong Kong

  • Junyi Zhu

    • The Chinese University of Hong Kong
    • Physics, The Chinese University of Hong Kong
    • Physics, Chinese Univsity of Hong Kong
    • Physics, The Chinese University of HongKong