Drude weight and total optical weight in a t-t'-J model

Details Drude weight and total optical weight in a t-t'-J model Drude weight and total optical weight in a t-t'-J model

1996-05-16

arxiv.org/abs/cond-mat/9605099v2

J. Phys.: Condens. Matter 8 (1996) 5089

Physics

Condensed Matter

7 pages, REVTEX file (3 Postscript figures). To appear in J. Phys.: Condens. Mattter

Scientific paper

10.1088/0953-8984/8/27/017

We study the Drude weight D and the total optical weight K for a t-t'-J model on a square lattice that exhibits a metallic phase-modulated antiferromagnetic ground state close to half-filling. Within a suitable 1/N expansion that includes leading quantum-fluctuation effects, D and K are found to increase linearly with small hole doping away from the Mott metal-insulator transition point at half-filling. The slow zero-sound velocity near the latter transition identifies with the velocity of the lower-energy branch of the twofold excitation spectrum. At higher doping values, D and K eventually saturate and then start to decrease. These features are in qualitative agreement with optical conductivity measurements in doped antiferromagnets.

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