To the theory of spin–charge separation in one-dimensional correlated electron systems

• Published in: Физика низких температур
• Date: 2004
• Main Author: Zvyagin, A.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2004
• Subjects: Низкоразмерные и неупорядоченные системы
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/119852
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: To the theory of spin–charge separation in one-dimensional correlated electron systems / A.A. Zvyagin // Физика низких температур. — 2004. — Т. 30, № 9. — С. 969–973. — Бібліогр.: 20 назв. — англ.

Spin—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.