Optical conductivity of a {ital t}-{ital J} ladder
- Laboratoire de Physique Quantique, Universite Paul Sabatier, 31062 Toulouse (France)
- Department of Physics, University of California Santa Barbara, Santa Barbara, California 93106-9530 (United States)
The optical conductivity {sigma}({omega}) of a doped two-leg {ital t}-{ital J} ladder is calculated for an electric field polarized parallel to the legs of the ladder. The low- and high-electron-density regimes behave differently, exhibiting Tomonaga-Luttinger-like and Luther-Emery-like behavior, respectively. We concentrate on the hole-doped region where the conductivity has a Drude weight proportional to the hole doping and an apparent threshold for absorption (a pseudogap) which may be associated with the energy to break a pair. This pseudogap in {sigma}({omega}) is present even though the pairs have a modified {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}}-like wave function because the geometry of the ladder leads to quasiparticle states which probe the gap along an antinode. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG03-85ER45197
- OSTI ID:
- 280214
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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