Evidence of circular shift vector observed in PT symmetric system induced by subgap photo excitation

ORAL

Abstract

PT symmetric materials serve as a highly rich playground for new types of topological states of matter, which can be probed with optics. In this work, we use time-resolved rotational anisotropy second harmonic generation (tr-RASHG) to observe the effects of subgap photoexcitation in PT symmetric antiferromagnetic material Cr2O3. At normal (pump) incidence a circular light induced optical rectification effect is symmetry forbidden. However, we find that pumping the material at oblique incidence can cause an ultrafast rectified response in the material that breaks the in-plane rotational symmetry that is dependent on both antiferromagnetic domain and helicity. Our results indicate the potential observation of a shift vector induced by circularly polarized light in a PT symmetric system.

*DOE (Award No. DE-SC0023017), NSF GRFP

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Presenters

  • Casey Li

    • University of California, Los Angeles

Authors

  • Casey Li

    • University of California, Los Angeles

  • XINSHU ZHANG

    • University of California, Los Angeles

  • Tyler Carbin

    • University of California, Los Angeles

  • Kai Du

    • Rutgers University

  • Kefeng Wang

    • Rutgers University

  • Sang-Wook Cheong

    • Rutgers University

  • Daniel Kaplan

    • Rutgers University

  • Anshul Kogar

    • University of California, Los Angeles
    • UCLA