100 citations · 245 across the 7 of their papers we have counts for
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The antiferromagnetic spin-1/2 Heisenberg model on the square lattice in a magnetic field
Andreas Luscher, Andreas Laeuchli
We study the field dependence of the antiferromagnetic spin-1/2 Heisenberg model on the square lattice by means of exact diagonalizations. In a first part, we calculate the spin-wa…
The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
Andreas Luscher, Reinhard M. Noack, Andreas Laeuchli
We explore the pairing properties of the one-dimensional attractive Hubbard model in the presence of finite spin polarization. The correlation exponents for the most important fluc…
Effective action of the weakly doped t-J model and spin-wave excitations in the spin-glass phase of La_{2-x}Sr_xCuO_4
Andreas Luscher, Alexander I. Milstein, Oleg P. Sushkov
We derive the low-energy effective field theory of the extended t-J model in the regime of light doping. The action includes a previously unknown Berry phase term, which is discuss…
Spatial noise correlations of a chain of ultracold fermions - A numerical study
Andreas Luscher, Andreas Laeuchli, Reinhard M. Noack
We present a numerical study of noise correlations, i.e., density-density correlations in momentum space, in the extended fermionic Hubbard model in one dimension. In experiments w…
Destruction of Neel order and local spin spirals in insulating La_{2-x}Sr_xCuO_4
Andreas Luscher, Alexander I. Milstein, Oleg P. Sushkov
Starting from the t-J model, we derive an effective field theory describing the spin dynamics in the insulating phase of La_{2-x}Sr_xCuO_4, x < 0.055, at low temperature. Using Mon…
Spin-flop transitions and spin-wave gaps in La_2CuO_4
Andreas Luscher, Oleg P. Sushkov
We study the spin-wave spectrum and the spin-flop transitions in La_2CuO_4 in a uniform magnetic field at zero temperature. Using the non-linear sigma-model, we show that a field a…