Spin and charge velocities of one-dimensional boson-fermion mixture

ORAL

Abstract

We study the ground state and elementary excitations of a one-dimensional mixture of scalar bosons and spin-1/2 fermions with repulsive delta-function interaction by the Bethe-ansatz method. Though the ground state properties are dramatically changed once bosons are mixed into fermions, the spin and charge excitations still feature linear dispersions, and their velocities satisfy a simple universal relation.

*This work is partly supported by HKRGC of No. CUHK-401504, and NSFC under Grant No. 10574150.

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Authors

  • Shi-Jian Gu

    • Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China
    • Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, China
    • Department of Physics, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong
    • Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Hong Kong, China

  • Junpeng Cao

    • Institute of Physics and Laboratory of Condensed Matter Physics, The Chinese Academy of Sciences, China
    • Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

  • Lin Haiqing

    • Department of Physics and Institue of Theoretical Physics, The Chinese University of Hong, Hong Kong, China
    • Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China
    • Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, China
    • Chinese University of Hong Kong
    • Department of Physics, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong