Charge dynamics and spin order in doped Hubbard models

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00754949· OSTI ID:102573

Kampf, A P; Brenig, W ^[1]

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1. Universitaet zu Koeln (Germany)

Hole motion in an antiferromagnetic (AF) environment is accompanied by the emission of spin wave excitations. Spin-wave shakeoffs are responsible for incoherent contributions to the dynamics of propagating holes. Using a spin-density-wave polaron scheme the authors calculate the optical conductivity {sigma}({omega}) and show that the incoherent part of the hole spectrum contributes to the low-frequency part of {sigma}({omega}). Separately, the authors discuss the possible formation of spiral spin patterns upon doping of the half-filled one-band Hubbard model. In particular, the authors consider the influence of band structure effects arising from nearest- and next-nearest-neighbor hopping processes on a square lattice. Differences in the ground state spin patterns for hole and electron doping are obtained offering a possible explanation for the persistence of AF order in low electron-doped cuprate superconductors.

• Sponsoring Organization: USDOE
• OSTI ID: 102573
• Report Number(s): CONF-9309321--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 1-2 Vol. 95; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
COPPER OXIDES
DYNAMICS
ELECTRIC CONDUCTIVITY
EXCITATION
HOLES
HUBBARD MODEL
SPIN WAVES
VISIBLE RADIATION