Spin superconductivity and ac-Josephson effect in Graphene system under strong magnetic field

ORAL

Abstract

We study the spin superconductivity in Graphene system under strong magnetic field. From the microscopically Gor'kov method combined with the Aharonov-Casher effect, we derive the effective Landau-Ginzburg free energy and analyze the time evolution of order parameter, which is confirmed to be the off-diagonal long range order. Meanwhile, we compare the ground state of spin superconductivity to the canted-antiferromagnetic state, and demonstrate the equivalence between these two states. Moreover, we give out the pseudo-field flux quantization condition of spin supercurrent, and propose an experimental measurable ac-Josephson effect of spin superconductivity in this system.

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Authors

  • Haiwen Liu

    International Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China

  • Hua Jiang

    Soochow University, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China

  • Qing-feng Sun

    ICQM, School of Physics, Peking University, Beijing, 100871, China, International Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China

  • X.C. Xie

    ICQM, School of Physics, Peking University, Beijing, 100871, China, Peking University, International Center for Quantum Materials, School of Physics, Peking University, International Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China