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Phys. Rev. B 65, 155117 (2002) [6 pages]

Optical and transport properties in a doped two-leg ladder antiferromagnet

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Jihong Qin and Yun Song
Department of Physics, Beijing Normal University, Beijing 100875, China

Shiping Feng
Department of Physics, Beijing Normal University, Beijing 100875, China;
The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875, China;
National Laboratory of Superconductivity, Academia Sinica, Beijing 100080, China

Wei Yeu Chen
Department of Physics, Tamkang University, Tamsui 25137, Taiwan

Received 26 September 2001; revised 3 December 2001; published 5 April 2002

Within the t-J model, the optical and transport properties of the doped two-leg ladder antiferromagnet are studied based on the fermion-spin theory. It is shown that the optical and transport properties of the doped two-leg ladder antiferromagnet are mainly governed by holon scattering. The low-energy peak in the optical conductivity is located at a finite energy, while the resistivity exhibits a crossover from the high-temperature metalliclike behavior to the low-temperature insulatinglike behavior, which is consistent with the experiments.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.155117
DOI:
10.1103/PhysRevB.65.155117
PACS:
71.27.+a, 74.20.Mn, 72.10.-d
 
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