171 citations · 289 across the 10 of their papers we have counts for
10 papers
Diagrammatic approximations for the 2d quantum antiferromagnet: exact projection of auxiliary fermions
Jan Brinckmann, Peter Woelfle
We present diagrammatic approximations to the spin dynamics of the 2d Heisenberg antiferromagnet for all temperatures, employing an auxiliary-fermion representation. The projection…
Auxiliary-Fermion Approach to Critical Fluctuations in the 2D Quantum AF Heisenberg Model
Jan Brinckmann, Peter Woelfle
The nearest-neighbor quantum-antiferromagnetic (AF) Heisenberg model for spin 1/2 on a two-dimensional square lattice is studied in the auxiliary-fermion representation. Expressing…
Energy Scales in the Local Magnetic Excitation Spectrum of YBCO
Jan Brinckmann, Patrick A. Lee
The wave-vector integrated dynamical spin susceptibility chi_{2D}(omega) of YBCO cuprates is considered. chi_{2D} is calculated in the superconducting state from a renormalized mea…
Renormalized mean-field theory of the neutron scattering in cuprate superconductors
Jan Brinckmann, Patrick A. Lee
The magnetic excitation spectrum of the t-t'-J-model is studied in mean-field theory and compared to inelastic neutron-scattering (INS) experiments on YBCO and BSCCO superconductor…
Slave Boson Approach to The Neutron Scattering in YBCO Superconductors
Jan Brinckmann, Patrick A. Lee
The evolution of the so-called `41meV resonance' in the magnetic response of YBCO cuprates is studied with slave-boson theory for the t-t'-J-model. The resonance appears as a colle…
Spin susceptibility and the pi-excitation in underdoped cuprates
Jan Brinckmann, Patrick A. Lee
The dynamical spin susceptibility chi'' at wave vector (pi, pi) and the spectrum pi'' of the spin-triplet particle--particle excitation with center of mass momentum (pi, pi) (pi-ex…