Spin-charge gauge approach to metal-insulator crossover and transport properties in High-T$_c$ cuprates

Details Spin-charge gauge approach to metal-insulator crossover and transport properties in High-T$_c$ cuprates Spin-charge gauge approach to metal-insulator crossover and transport properties in High-T$_c$ cuprates

2007-01-08

arxiv.org/abs/cond-mat/0701139v2

J.Phys.Condens.Matter19:125212,2007

Physics

Condensed Matter

Superconductivity

32 pages, to appear in the special issue on "Correlated Electrons" of J. Phys.: Condens. Matt

Scientific paper

10.1088/0953-8984/19/12/125212

The spin-charge gauge approach to consider the metal-insulator crossover (MIC) and other anomalous transport properties in High-T$_c$ cuprates is briefly reviewed. A U(1) field gauging the global charge symmetry and an SU(2) field gauging the global spin-rotational symmetry are introduced to study the two-dimensional $t-J$ model in the limit $t\gg J$. The MIC as a clue to the understanding of the ``pseudogap'' (PG) phase, is attributed to the competition between the short-range antiferromagnetic order and dissipative motion of charge carriers coupled to the slave-particle gauge field. The composite particle formed by binding the charge carrier (holon) and spin excitation (spinon) via the slave particle gauge field exhibits a number of peculiar properties, and the calculated results are in good agreement with experimental data for both PG and ``strange metal'' phases. Connections to other gauge field approaches in studying the strong correlation problem are also briefly outlined.

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