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.

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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