To the theory of spin-charge separation in one-dimensional correlated electron systems
Ключові слова:PACS: 71.27. a, 71.10.Fd, 71.10.Pm
АнотаціяSpin—charge separation is considered to be one of the key properties that distinguish low-dimensional electron systems from others. Three-dimensional correlated electron systems are described by the Fermi liquid theory. There, low-energy excitations (quasiparticles) are reminiscent of noninteracting electrons: They carry charges -e and spins 1/2 . It is believed that for any one-dimensional correlated electron system, low-lying electron excitations carry either only spin and no charge, or only charge without spin. That is why recent experiments looked for such low-lying collective electron excitations, one of which carries only spin, and the other carries only charge. Here we show that despite the fact that for exactly solvable one-dimensional correlated electron models there exist excitations which carry only spin and only charge, in all these models with short-range interactions the low-energy physics is described by low-lying collective excitations, one of which carries both spin and charge.
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Zvyagin, A. To the Theory of Spin-Charge Separation in One-Dimensional Correlated Electron Systems. Fiz. Nizk. Temp. 2004, 30, 969-973.
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