Theoretical Physics Seminar:
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Mar 09, 2007 01:00 PM, Theoretical Physics Seminar Room, LC.3.17
Exotic quasi-particles in dynamics of one-dimensional electrons
Speaker: Kuramoto, Y
Abstract: Interactions among one-dimensional electrons cause nonperturbative effects such as instability of the Fermi liquid and the spin-charge separation. Understanding of dynamics probed by neutron scattering and photoemission requires a global theory beyond the scope of the standard Tomonaga-Luttinger or conformal field theories focusing on the infrared limit. We first review relevant experimental results, and take the supersymmetric t-J model with a long-range (1/r^2) interaction which permits derivation of explicit dynamical quantities. We present exact results for static correlation functions, dynamical structure factor, and one-particle spectral functions. It is shown that spin and charge excitations are carried by exotic quasi-particles which obey neither Fermi nor Bose statistics. In the particular momentum range, these fractional particles seem to recombine to make up an electron. Hence an electron can be regarded as a composite particle from an excitation point of view.
