Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-09-28
Phys. Rev. B 77, 075128 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages
Scientific paper
10.1103/PhysRevB.77.075128
Theory of quantum electrodynamics in three spatial-time dimension is applied to the two-dimensional $S=1/2$ quantum Heisenberg antiferromagnet in order to investigate a doped hole in high-temperature superconductors. Strong coupling analysis of the U(1) gauge field interaction is carried out to describe spectral broadening observed in the undoped compounds. It is found that the fermionic quasiparticle spectrum is of Gaussian form with the width about 3J, with J being the superexchange interaction energy. The energy shift of the spectrum is on the order of the quasiparticle band width, which suggests that the system is in the strong coupling regime with respect to the gauge field interaction describing the phase fluctuations about the staggered flux state.
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