TY - JOUR
T1 - Dynamical properties of the 1/r2-type supersymmetric t-J model in a magnetic field
T2 - Manifestation of spin-charge separation
AU - Saiga, Yasuhiro
AU - Kuramoto, Yoshio
PY - 2000/12
Y1 - 2000/12
N2 - Quasi-particle picture in a magnetic field is pursued for dynamical spin and charge correlation functions of the one-dimensional supersymmetric t-J model with inverse-square interaction. With use of exact diagonalization and the asymptotic Bethe-ansatz equations for finite systems, excitation contents of relevant excited states are identified which are valid in the thermodynamic limit. The excitation contents are composed of spinons, antispinons, holons and antiholons obeying fractional statistics. Both longitudinal and transverse components of the dynamical spin structure factor are independent of the electron density in the region where only quasi-particles with spin degrees of freedom (spinons and antispinons) contribute. The dynamical charge structure factor does not depend on the spin-polarization density in the region where only quasi-particles with charge (holons and antiholons) are excited. These features indicate the strong spin-charge separation in dynamics, reflecting the high symmetry of the model.
AB - Quasi-particle picture in a magnetic field is pursued for dynamical spin and charge correlation functions of the one-dimensional supersymmetric t-J model with inverse-square interaction. With use of exact diagonalization and the asymptotic Bethe-ansatz equations for finite systems, excitation contents of relevant excited states are identified which are valid in the thermodynamic limit. The excitation contents are composed of spinons, antispinons, holons and antiholons obeying fractional statistics. Both longitudinal and transverse components of the dynamical spin structure factor are independent of the electron density in the region where only quasi-particles with spin degrees of freedom (spinons and antispinons) contribute. The dynamical charge structure factor does not depend on the spin-polarization density in the region where only quasi-particles with charge (holons and antiholons) are excited. These features indicate the strong spin-charge separation in dynamics, reflecting the high symmetry of the model.
KW - Dynamical charge structure factor
KW - Dynamical spin structure factor
KW - Exact diagonalization
KW - Inverse-square interaction
KW - Magnetic field
KW - Recursion method
KW - Spin-charge separation
KW - Supersymmetric t-J model
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U2 - 10.1143/JPSJ.69.3917
DO - 10.1143/JPSJ.69.3917
M3 - Article
AN - SCOPUS:0034549143
VL - 69
SP - 3917
EP - 3931
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 12
ER -