Fermionization for charge degrees of freedom and bosonization of spin degrees of freedom in the SU(2) slave-boson theory
- Institute de Physique Theorique, CEA, IPhT, CNRS, URA 2306, F-91191 Gif-sur-Yvette (France)
Fermionizing the charge sector and bosonizing the spin part in the SU(2) slave-boson theory, we derive an effective-field theory for dynamics of doped holes in the antiferromagnetically correlated spin background, where spin fluctuations are described by an SO(5) Wess-Zumino-Witten (WZW) theory while dynamics of doped holes is characterized by QED{sub 3} with a chemical-potential term. An important feature of our effective-field theory is the coupling term between valence-bond fluctuations and doped holes. Considering that valence-bond fluctuations are deeply related with monopole excitations of staggered U(1) gauge fields in the bosonic field theory for spin fluctuations, we demonstrate that hole dynamics helps deconfinement of bosonic spinons near the quantum critical point of the SO(5) WZW theory. We solve this effective-field theory in the Eliashberg framework and find non-Fermi-liquid physics in thermodynamics and transport, where z=3 criticality with dynamical exponent z plays an important role for hole dynamics. We discuss validity of our field theory, applying it to a doped spin chain and comparing it with the slave-fermion framework. Furthermore, we discuss instability of the anomalous metallic phase against superconductivity and density waves of doped holes, resulting from competition between gauge and valence-bond fluctuations.
- OSTI ID:
- 21192485
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 78, Issue 19; Other Information: DOI: 10.1103/PhysRevB.78.195113; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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