604 citations · 2.1k across the 64 of their papers we have counts for
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Spin fluctuations and pseudogap in the two-dimensional half-filled Hubbard model at weak coupling
N. Dupuis
Starting from the Hubbard model in the weak-coupling limit, we derive a spin-fermion model where the collective spin excitations are described by a non-linear sigma model. This res…
Spin-density-wave instabilities in the organic conductor (TMTSF)_2ClO_4: Role of anion ordering
K. Sengupta, N. Dupuis
We study the spin-density-wave instabilities in the quasi-one-dimensional conductor (TMTSF)_2ClO_4. The orientational order of the anions ClO_4 doubles the unit cell and leads to t…
Spin waves in the spiral phase of a doped antiferromagnet: a strong-coupling approach
N. Dupuis
We study spin fluctuations in the spiral phase of the two-dimensional Hubbard model at low doping on the basis of the spin-particle-hole coherent-state path integral. In the strong…
A new approach to strongly correlated fermion systems: the spin-particle-hole coherent-state path integral
N. Dupuis
We describe a new path integral approach to strongly correlated fermion systems, considering the Hubbard model as a specific example. Our approach is based on the introduction of s…
Effect of nearest- and next-nearest neighbor interactions on the spin-wave velocity of one-dimensional quarter-filled spin-density-wave conductors
Y. Tomio, N. Dupuis, Y. Suzumura
We study spin fluctuations in quarter-filled one-dimensional spin-density-wave systems in presence of short-range Coulomb interactions. By applying a path integral method, the spin…