Terahertz optical diode effect in multiferroics FeZnMo3O8 and BaCoSiO4

ORAL

Abstract

We present a terahertz (THz) spectroscopic study of multiferroic FeZnMo3O8 and BaCoSiO4. THz optical diode effect (ODE) is observed in both compounds. Two mechanisms for the ODE will be discussed in term of symmetry. The ODE in FeZnMo3O8 is due to the toroidal moment which is the vector of cross product of polarization and magnetization. When the light is travelling along toroidal moment, the propagation of light is nonreciprocal if we flip the propagation direction. While the propagation of light in BaCoSiO4 which has magneto-chiral structure is also nonreciprocal. For both of materials, the magnetic excitation plays a key to ODE. Magnetic dipole active magnetic excitation which is from electron spin resonance between the eigenstates of single-ion anisotropy Hamiltonian produces giant ODE in paramagnetic FeZnMo3O8 where the material doesn’t have long range magnetic ordering. However, the magnetic excitation in BaCoSiO4 generates weaker ODE in ferrimagnetic phase. We will discuss the resonant enhancement of the THz optical diode effect in both materials due to terahertz-frequency spin excitations.

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Presenters

  • Shukai Yu

    Department of Physics and Engineering Physics, Tulane University, New Orleans, LA, United States., Tulane University

Authors

  • Shukai Yu

    Department of Physics and Engineering Physics, Tulane University, New Orleans, LA, United States., Tulane University

  • Bin Gao

    Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University

  • Jae Wook Kim

    Rutgers University, New Brunswick, Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University

  • Alemayehu S. Admasu

    Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University

  • Xianghan Xu

    Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick

  • Sang-Wook Cheong

    Rutgers University, Department of Physics and Astronomy, Rutgers University, Rutgers University, New Brunswick, Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University, Center for Quantum Materials Synthesis and Department of Physics and Astronomy, Rutgers, the State University of New Jersey, Department of Physics, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA, Physics, Rutgers University, Physics and Astronomy, Rutgers University, New Brunswick, Department of Physics and Astronomy, Rutgers University, New Jersey, Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science, RCEM, Department of Physics and Astronomy, Rutgers U., Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials

  • Xing Zhu

    Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University

  • Michael K. L. Man

    Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University

  • Julien Madéo

    Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University

  • Keshav M Dani

    Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University

  • Diyar Talbayev

    Department of Physics and Engineering Physics, Tulane University, New Orleans, LA, United States., Tulane University