Large terahertz resonance in MnGe thin films

ORAL

Abstract

Topological nature of matters often plays an important role in transport phenomena such as Hall effect. For example, the large anomalous Hall effect (AHE) and topological Hall effect (THE) have been observed in bulk MnGe [1]. In this study, we investigate the optical Hall conductivity by means of terahertz time domain spectroscopy in MnGe thin films. While the diagonal conductivity can be well described by the conventional Drude model, the Hall conductivity spectra show the large resonance structure at ~ 1.2 meV, which is significantly enhanced and dominates the DC Hall conductivity at low temperatures. We further analyze the Hall conductivity spectra based on the Karplus-Luttinger model, which indicates that the resonance structure consists of two interband transitions corresponding to AHE and THE.
[1] N. Kanazawa, et al., Phys. Rev. Lett. 106, 156603 (2011).

–

Presenters

  • Yoshihiro Okamura

    University of Tokyo

Authors

  • Yoshihiro Okamura

    University of Tokyo

  • Yudai Hayashi

    University of Tokyo

  • Naoya Kanazawa

    University of Tokyo

  • Atsushi Tsukazaki

    Tohoku University, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, IMR Tohoku University, IMR, Tohoku Univ., Institute for Materials Research, Tohoku University

  • Masashi Kawasaki

    The University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Tokyo 113-8656, Japan, University of Tokyo, Applied Physics and QPEC, University of Tokyo, Department of applied physics, The University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Tokyo, Japan.

  • Masakazu Ichikawa

    University of Tokyo

  • Yoshinori Tokura

    RIKEN Center for Emergent Matter Science (CEMS), RIKEN Center for Emergent Matter Science, RIKEN CEMS, RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan, Center for Emergent Matter Science (CEMS), RIKEN, Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, University of Tokyo, University of Tokyo and RIKEN CEMS, CEMS, RIKEN, Center for Emergent Matter Science, RIKEN, Department of Applied Physics, University of Tokyo, University of Tokyo and RIKEN-CEMS

  • Youtarou Takahashi

    University of Tokyo