Realization of a non-Hermitian optical Raman lattice for ultracold fermions

ORAL

Abstract

The recent advances in non-Hermitian physics open new possibilities for exploring unprecedented quantum states in an open atomic system. In our previous study[1], we have realized non-Hermitian spin-orbit coupled bands for ultracold fermions in bulk, and demonstrated the topological nature of non-Hermitian energy band near the band closing point when the Parity-Time symmetry breaking transition occurs. In this talk, we report our progress on the experimental development of the non-Hermitian optical Raman lattice, which generalizes non-Hermitian spin-orbit coupling into the lattice system. Focusing on the time evolution of spin texture in Bloch bands, we explore the distinct features induced by a highly controllable spin-dependent dissipation and spin-orbit coupling. It is expected that this non-Hermitian platform would allow us to further expand the possibilities of studying the non-Hermitian topological phases in lattices.

*We acknowledge the generous support from the Research Grants Councils of Hong Kong, the Croucher Foundation, Guangdong Joint laboratory and the Harilela foundation through 16304918, 16308118, 16306119, 16302420,16302821, C6005-17G, C6009-20G, RFS2122-6S04 and N-HKUST601/17, respectively.

–

Publication: [1]Zejian Ren, Dong Liu, Entong Zhao, Chengdong He, Ka Kwan Pak, Jensen Li, Gyu-Boong Jo, Chiral control of quantum states in non-Hermitian spin–orbit-coupled fermions. Nature Physics, 1-5. (2022).

Presenters

  • Entong ZHAO

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • Hong Kong University of Science and Technology(HKUST)
    • The Hong Kong University of Science and Technology

Authors

  • Entong ZHAO

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • Hong Kong University of Science and Technology(HKUST)
    • The Hong Kong University of Science and Technology

  • Chengdong HE

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • Hong Kong University of Science and Technology
    • The Hong Kong University of Science and Technology

  • Zejian Ren

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • The Hong Kong University of Science and Technology

  • Ka Kwan PAK

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • Hong Kong University of Science and Technology
    • The Hong Kong University of Science and Technology

  • Yujun Liu

    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China
    • Hong Kong University of Science and Technology

  • Gyu-Boong Jo

    • Hong Kong University of Science and Tech
    • Department of Physics, Hong Kong University of Science and Technology, Hong Kong SAR, China; IAS Center for Quantum Technologies, Clear Water Bay, Kowloon, Hong Kong SAR, China
    • Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; IAS Center for Quantum Technologies, HKUST, Clear Water
    • The Hong Kong University of Science and Technology